Intel Optane SSD P5800X Review: The Fastest SSD Ever

Intel Optane SSD P5800X Review: The Fastest SSD Ever
When we reviewed the Intel Optane SSD 905P back in 2018, despite a significant price premium over NAND-based SSDs, we gave the drive and editor’s choice due to its exceptional performance where it mattered most for consumers, e.g. access times and random transfers at low queue depths. Intel Optane solid state drives typically offer much…

Source: Hot Hardware – Intel Optane SSD P5800X Review: The Fastest SSD Ever

Amazon calls for FTC chair Lina Khan's recusal from antitrust investigations

Amazon has requested the recusal of Federal Trade Commission Chair Lina Khan from the agency’s antitrust investigations into the company. “Amazon.com, Inc. respectfully petitions the commission for recusal of Chair Lina Khan from any antitrust investigation, adjudication, litigation, or other proceeding in which Amazon is a subject, target or defendant for which Chair Khan’s prior public statements create the appearance of her having prejudged facts and/or legal issues relevant to the proceeding,” the company said in a 25-page filing.

President Joe Biden appointed Khan as FTC chair this month on the same day she won confirmation as an agency commissioner. She came to prominence as a critic of major tech companies, including Amazon. Khan published a Yale Law Journal article in 2017 titled “Amazon’s Antitrust Paradox,” in which she argued that US policies and laws weren’t enough to keep giants like Amazon accountable.

“Given her long track record of detailed pronouncements about Amazon, and her repeated proclamations that Amazon has violated the antitrust laws, a reasonable observer would conclude that she no longer can consider the company’s antitrust defenses with an open mind,” Amazon said in the filing, as The Wall Street Journal notes.

The FTC is looking into Amazon as part of a series of investigations against major tech companies. The agency is also reviewing Amazon’s plan to buy movie studio MGM for $8.45 billion.

Khan previously worked with the House Judiciary’s antitrust subcommittee on a 16-month probe into Amazon, Apple, Facebook and Google. Last year, Democrats on the panel called on Congress to consider breaking up those companies. During her confirmation hearing, Khan said she would speak with FTC ethics officials regarding a possible recusal if needed.



Source: Engadget – Amazon calls for FTC chair Lina Khan’s recusal from antitrust investigations

Microsoft Exec: Targeting of Americans' Records 'Routine'

Federal law enforcement agencies secretly seek the data of Microsoft customers thousands of times a year, according to congressional testimony Wednesday by a senior executive at the technology company. From a report: Tom Burt, Microsoft’s corporate vice president for customer security and trust, told members of the House Judiciary Committee that federal law enforcement in recent years has been presenting the company with between 2,400 to 3,500 secrecy orders a year, or about seven to 10 a day. “Most shocking is just how routine secrecy orders have become when law enforcement targets an American’s email, text messages or other sensitive data stored in the cloud,” said Burt, describing the widespread clandestine surveillance as a major shift from historical norms.

The relationship between law enforcement and Big Tech has attracted fresh scrutiny in recent weeks with the revelation that Trump-era Justice Department prosecutors obtained as part of leak investigations phone records belonging not only to journalists but also to members of Congress and their staffers. Microsoft, for instance, was among the companies that turned over records under a court order, and because of a gag order, had to then wait more than two years before disclosing it.

Read more of this story at Slashdot.



Source: Slashdot – Microsoft Exec: Targeting of Americans’ Records ‘Routine’

The Best Way to Clean Your Vacuum Brush, According to TikTok

Vacuum cleaners can clog by things getting stuck in the hose or from an over-full canister, but most clogs are easily solved by just regularly emptying your vacuum. Hair and string, though, tend to wrap around the vacuum brush and can restrict its movement, causing a slow death until it stops spinning altogether,…

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Source: LifeHacker – The Best Way to Clean Your Vacuum Brush, According to TikTok

NVIDIA 470 EOL Drivers For Kepler Still Obliterating Open-Source Alternative

With the recent NVIDIA 470 series Linux driver beta this R470 branch is the point at which NVIDIA is ending its GeForce 600/700 series “Kepler” support. The 470 driver series will be maintained as a long-lived driver that will continue to see security updates and Linux kernel / X.Org Server compatibility updates for another three years. If this end-of-life status has you thinking about trying out the open-source “Nouveau” Linux driver with Kepler, here are some current benchmarks.

Source: Phoronix – NVIDIA 470 EOL Drivers For Kepler Still Obliterating Open-Source Alternative

watchOS 8 beta hands-on: Subtle but useful changes

With the iOS 15 and watchOS 8 public betas now available for testing, it’s time for us to get an early look at some of the features coming to Apple’s biggest platforms. While the next watchOS might not be as big a change as iOS 15, it still introduces new tools that promise better integration with your iPhone, along with some health and fitness updates.

If you’re thinking of checking the public beta out for yourself, make sure you’ve thought twice about the risk of running preview software instead of a stable release. Those who simply can’t wait for a stable public release of the upcoming platform can sign up for Apple’s beta program and install the builds now, provided you have an Apple Watch Series 3 and newer, as well as an iPhone running the iOS 15 beta. Either way, we’ve checked out the watchOS 8 beta so you can see from a safe distance or decide if the changes are worth the trouble right now.

Mindfulness, health and fitness

Though there aren’t huge updates coming to watchOS 8, Apple’s new health-centric features could interest those looking for a more wholistic approach to wellbeing. The company has renamed its Breathe app to Mindfulness, adding a meditation guide to the existing breathing exercises. You can set each Mindfulness session’s duration to 1, 2, 3, 4 or 5 minutes before starting. A prompt appears before each session to help you focus your thoughts, along with a button to begin. 

So far, I’ve seen typical meditation prompts that tell you to be aware of your thoughts and let them pass without judgement. Some other examples include “Think of someone you care about. Imagine you can feel your connection with them” and “Consider the values that matter to you in something you’re focused on.”

Then, a colorful swirling animation takes up the screen. I usually just lean back and close my eyes at this point, but if you continue to stare at your watch, the animation is a nice distraction that’s almost hypnotizing. At the end of your set time, the watch vibrates and shows a closing thought tied to the opening prompt, like “Bring this sense of open awareness with you.” You’ll also see your total Mindful minutes for the day (which includes time spent doing Breathe exercises) and your heart rate. After two Mindfulness sessions, my Apple Watch SE said my pulse plummeted from 67 to 47bpm, which is great I guess.

On its own, this feels like a glorified timer meets fortune cookie meets Magic 8 Ball, all set to Windows Music Player-style visualizations. But combined with reminders throughout the day that you can customize, Mindfulness could help remind you to check in with yourself periodically to assess your state of mind.

A few other health-centric additions to watchOS include two new Workout categories: Tai Chi and Pilates. I’ve yet to have a session of either exercise so I can’t say how accurately Apple tracks these yet. There are a couple more features I need more time to get a better sense for, including respiratory rate tracking overnight and walking steadiness. The latter requires about two weeks of walking with your iPhone stashed somewhere close to your body, so it’ll take some time before I get results. 

Messaging, watch faces and new apps

A big part of the watchOS 8 update is improved communications tools and integration with your iPhone. Notably, the Messages app now allows you to compose via Scribble, Dictate and Emojis all within the same screen. I scrawled out part of a message, dictated longer parts of it, and added emoji from one page easily. Editing is also less of a hassle than before, thanks in large part to being able to use the Digital Crown as a cursor controller now. Hallelujah! Scrolling back to insert a space or fix a stray “v” got so much better. 

There’s also a new option now to send GIFs in Messages, from the same place you’d send a Digital Touch (just hit the search glass button and type in your keyword). 

This story is developing, please refresh for updates.



Source: Engadget – watchOS 8 beta hands-on: Subtle but useful changes

Disney's Dueling Jungle Cruise Trailers Pit Emily Blunt Against Dwayne Johnson

Two trailers, two stars, two completely different feels, one movie. That’s what you’re getting today for Disney’s Jungle Cruise, which opens in theaters, and on Disney+ with Premier Access, July 30. The film stars Dwayne Johnson and Emily Blunt and, much as they were when the film was still scheduled for a 2020…

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Source: Gizmodo – Disney’s Dueling Jungle Cruise Trailers Pit Emily Blunt Against Dwayne Johnson

AT&T will soon enable RCS messaging for all Android phones

AT&T is the latest carrier to make Messages by Google the default messaging service for all customers on Android devices. The move will replace the default messaging system, SMS, with Rich Communication Services technology, an open standard that prioritizes media, eliminates character limits, and generally upgrades the traditional texting experience. 

RCS unlocks the ability to share full-resolution photos and send larger media files than SMS can handle, it streamlines group chats, enables end-to-end encryption for one-on-one conversations, and it works over Wi-Fi or data. The transition for AT&T customers will take place soon, according to Google.

Google has been nudging the mobile industry toward RCS for years, and it’s finally catching on. T-Mobile is making the switch to Messages by Google, and therefore RCS messaging, by the end of the year, and now AT&T is doing the same. 

However, Verizon hasn’t announced plans to adopt RCS — and neither has Apple, for that matter.



Source: Engadget – AT&T will soon enable RCS messaging for all Android phones

Instagram is working on a paid Stories subscription feature

Instagram has confirmed it’s working on a new feature called “Exclusive Stories.” Since June 21st, images of the Stories offshoot have circulated online after software developer Alessandro Paluzzi shared on Twitter that they had found references to the feature in Instagram’s codebase. On Wednesday, the company told TechCrunch the screenshots showcase an internal prototype it’s working on behind the scenes. Unfortunately, Instagram didn’t reveal any other details about the project, noting it had nothing more to share when Engadget reached out.

But what we can gather from the screenshots is that the feature is Instagram’s take on Twitter’s paid Super Follow subscription. When regular users stumble upon an Exclusive Story, Instagram will tell them “only members” can view the content. It also appears the company will prevent people from trying to screenshot what they see. At the same time, it will push creators to save their Exclusive Stories to a Highlight so that new members have something to view as they subscribe.

As with any insight that comes courtesy of someone finding early references to a new feature, there’s the possibility Instagram may never release the feature Paluzzi found. But the images clearly show the company is thinking about how it can entice creators to stay on the platform. If that means adapting a feature from one of its rivals, so be it. Facebook and Instagram have done that plenty of times in the past.



Source: Engadget – Instagram is working on a paid Stories subscription feature

Google Is Working On an HTTPS-Only Mode For Chrome

An anonymous reader writes: Following in the footsteps of browsers like Mozilla Firefox and Microsoft Edge, Google Chrome is also in line to receive an HTTPS-Only Mode that will upgrade all unencrypted HTTP connections to encrypted HTTPS alternatives, where possible. Currently, the new Chrome HTTPS-Only Mode is still under development in Chrome Canary distributions. Work is being done to add specific settings in the browser’s interface, and no actual HTTP-to-HTTPS functionality is currently present. The feature is expected to be ready for Chrome 93, set to be released later this fall.

Read more of this story at Slashdot.



Source: Slashdot – Google Is Working On an HTTPS-Only Mode For Chrome

How to Try iOS 15, watchOS 8, and iPadOS 15 Right Now

Most people are perfectly fine waiting until September for the annual upgrades to iOS, iPadOS, and watchOS. But for the impatient few among us, you can actually test out Apple’s next-generation software for the iPhone, iPad, and Apple Watch starting today by downloading the public betas if iOS 15, iPadOS 15, and…

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Source: Gizmodo – How to Try iOS 15, watchOS 8, and iPadOS 15 Right Now

With watchOS 8, Apple Wants to Help You Chill the Hell Out

When Apple previewed the features coming to watchOS 8, the next-gen software upgrade seemed iterative—great for overall performance, but perhaps lacking in terms of direction. This was especially true after watchOS 7, which turned the Apple Watch into a vital tool for navigating pandemic life. However, after living…

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Source: Gizmodo – With watchOS 8, Apple Wants to Help You Chill the Hell Out

LG Launches Drool-Worthy 86-Inch 8K Quantum Dot NanoCell TV With Mini LEDs

LG Launches Drool-Worthy 86-Inch 8K Quantum Dot NanoCell TV With Mini LEDs
LG is bolstering its lineup of big screen TVs with new models featuring Quantum Dot NanoCell technology and mini LEDs, aimed at the premium TV segment. Sizes start at 65 inches and go up from there. Can these new sets compete with OLED, though? That remains to be seen (literally), but the specifications are certainly promising.

The big

Source: Hot Hardware – LG Launches Drool-Worthy 86-Inch 8K Quantum Dot NanoCell TV With Mini LEDs

iOS 15 beta hands-on: A surprisingly complete preview

The iOS 15 public beta is live today, which means a larger swath of people can now check out the latest features coming to iPhones later this year. Despite being a beta, it’s surprisingly complete, with most of the coming changes already available. Some of the updates getting the most buzz are the new Focus modes and FaceTime sharing tools, but there are also changes across Messages, Maps, Weather, Safari, Photos and more to check out.

So far, the preview software seems largely stable. But as always with betas, think twice about how willing you are to risk bricking your phone in exchange for early access to new features. Regardless of whether that’s you, we’ve put together a detailed preview of how iOS 15 will work when it launches in the fall.

FaceTime: SharePlay, screen sharing and spatial audio

Though it would have been a lot more helpful if Apple had launched this feature during the throes of the pandemic, FaceTime’s SharePlay feature will still be useful for many of us. Whether you want to watch an episode of Ted Lasso with your long-distance buddy or provide remote tech support to your relatives, SharePlay and screen sharing over FaceTime will make your life a little easier.

A composite of two screenshots showing FaceTime's new control panel and screen sharing feature.
Screenshots of iOS 15 beta

Unfortunately, my colleague Mat Smith and I had to futz around for ages before we figured out how to SharePlay something. While screen sharing is more straightforward — just press a button at the bottom right of a new control panel at the top of FaceTime calls — SharePlay options only show up when you have a compatible media app open during a chat. Mat and I are seasoned tech journalists and we still spent some time looking for a SharePlay-specific button, which seems like the more intuitive way.

Once we figured it out, things went a little more smoothly. When you try to play an episode or video while on a FaceTime call, a window pops up asking if you want to use SharePlay. From there, you can choose to stream with your caller (or callers), play it only for yourself, or cancel.

As a reminder, depending on the app, both you and your friend will need subscriptions to watch stuff together on SharePlay. For Apple’s services like TV+ and Music, you’ll both need a subscription or trial. Other streaming apps like HBO Max, Hulu and Disney+ will be the ones that decide whether all parties need accounts to watch shows together on SharePlay, but it’s highly unlikely they allow it some other way.

On our attempts to stream episodes of Mythic Quest and Central Park on SharePlay, though, Mat and I kept getting a failure notice saying “Unable to SharePlay. This title isn’t available to SharePlay with people in different countries or regions.” It’s odd, since both those shows are available in both our regions. It’s also sad that you wouldn’t be allowed to watch it with someone abroad. Apple hasn’t said if this limit will be in place when iOS 15 launches, but if it is it’ll be disappointing for anyone that was looking forward to SharePlaying with their overseas partners, families and friends. We’ll update this article if Apple confirms this either way.

Screen sharing worked better. I was able to show Mat my dubious shopping list on Instagram though, as it does with other video chat apps, my camera automatically turned off whenever I shared my screen. When Mat streamed his display, his camera stayed on. We suspect this has something to do with the fact that he’s using a more capable iPhone 12 mini while I was on an aging iPhone XR that was burning up from my testing. This is a known issue with SharePlay that has been detailed in the iOS 15 developer beta release notes, so it may get fixed in time. 

A composite showing three screenshots of FaceTime's SharePlay feature in the iOS 15 beta.
Screenshots of the iOS 15 beta

Two other FaceTime features that are also live in this beta: links to join calls from non-Apple devices and spatial audio. The latter lets you hear each person in a call from the direction where they’re positioned on your FaceTime grid. Since it required multiple people running the beta to work, I couldn’t fully experience this. I got on a call with Mat and our former colleague Chris Velazco, and while Mat and I were able to hear each other from different directions, Chris wasn’t on the beta and did not notice the effect.

I also sent FaceTime web links to Chris, as well as Engadget staffers Nathan Ingraham and Valentina Palladino. The URL brought us to a page that prompted us to enter our names, and as the host I could choose to allow or block each would-be participant. Chris was able to join my call from a non-Apple laptop, while Valentina and Nate went through the browser on their Macs. Meanwhile, I was using an iPhone. Everyone looked and sounded great… to me.

Valentina and Nate couldn’t hear each other until they used the FaceTime app on their MacBooks. Chris also couldn’t hear other people on the call — all anyone heard was my beautiful voice. (As it should be.) But really, this appears to be an issue with how browsers handle audio input devices or a possible bug in the beta.

It’s not yet clear whether the region-specific SharePlay restrictions will also work this way in the stable release. But so far, barring some glitches, the updates to Apple’s video calling app appear meaty and potentially very useful.

Focus modes

I’ve spent too much time talking about FaceTime, so I’m going to try to succinctly describe the other iOS 15 features I’ve tested thus far. One of these felt incredibly relevant as I spent time finishing this article on deadline: Focus modes. Here, Apple allows you to customize profiles that will allow notifications from specific apps or people when enabled.

A composite showing three screenshots of the Focus Mode feature in the iOS 15 beta. The first two show shortcuts to enable profiles like Do Not Disturb, Personal, Sleep and Work. The screenshot on the right show a detailed Settings page for the Work profile.
Screenshots from the iOS 15 beta

Three placeholders are available at the start: Work, Bedtime and Personal. On your first time trying to enable each, you’ll have to set up which contacts and apps to allow. You can also choose to enable your Focus Status so people who try to reach you will see that you’re away when they’re using a compatible app. Developers of messaging apps will have to use Apple’s API to enable this, so that your friends who hit you up on, say, Telegram or Facebook Messenger will see your status too.

For now, only Apple’s own Messages supports it and I was able to see below our conversation that Mat had silenced notifications. I sent a message anyway, and the app showed my text was “delivered quietly.” Just like you can on Slack, you can choose to “notify anyway” so your message breaks through the wall of silence. (I’m not an awful person so I didn’t, poor Mat had already put up with my relentless testing and FaceTiming all day.)

With each Focus mode, you can also pick a home screen showing just the apps you want. To do so, you’ll have to first create each page as an additional panel on your main screen, then select the relevant one when customizing your Focus mode. I created a barebones page with just four apps and designated it as my main Personal screen. I also made a different option for Work and was able to have apps appear on multiple pages — Instagram and Twitter could be placed on every page, for example. When each mode was enabled, I couldn’t see any other page; swiping sideways only showed the apps drawer and the Today view.

I haven’t spent enough time with the beta to know how useful these customized views will be, but I’m already in love with the ability to pick different notifications profiles. You can also set them to automatically activate based on the time of day, your location or app usage. Again, this is something I’ll need to use for more than a few days, but I appreciate the concept. Unfortunately, I haven’t encountered Notifications summaries in the beta yet.

Live text (aka Apple’s version of Google Lens)

Many other iOS 15 updates are similar to features that competitors already offer, and the most obvious of these is Live Text. This tool scans the photos on your device for words and turns them into text you can actually use, whether it’s copying and pasting a phone number to another app or translating foreign words on a menu. This is basically Apple’s answer to Google Lens, which has been around for years.

A composite showing three screenshots of Apple's Live Text feature through the viewfinder in the Camera app in the iOS 15 beta. The left screenshot shows a small yellow frame focused on the middle of a bottle of green moisturizer, the middle screenshot shows the middle part of the bottle highlighted with options above it for
Screenshots of the iOS 15 beta

Similar to Lens, Apple’s version will show a small symbol at the bottom right of each image in the Photos app to indicate it’s found something. Tap that icon, and all the characters in that picture will be highlighted, and you can select the portions you need. I snapped a picture of my bottle of moisturizer and was able to copy all the words on the label and URLs also got identified as links I could click through. You can also use Live Text via the Camera app’s viewfinder without snapping a shot, by the way. When your phone detects words in the scene, the same icon will appear in the bottom right and you can hit it to pull up the snippets that Live Text noticed.

So far, this generally performed as expected, though it’s worth noting that as its name suggests, Live Text only works on images that have a lot of words in them. But even a photo of my dinner, which included a container of yogurt with a brand name prominently displayed on it, didn’t trigger Live Text. Google’s Lens, meanwhile, will identify buildings, pets, furniture and clothes in pictures with nary a letter in them.

Maps, Photos and generally tighter integration

Elsewhere in iOS 15 you’ll find updates to Maps, Weather and Photos. In some cities, Apple’s maps look richer and more detailed than before, thanks to meticulous drawings of individual trees, lanes, traffic lights and more. I was able to explore a golf course in San Francisco, as well as the Conservatory of Flowers and Dutch Windmill in the Golden Gate Park in surprisingly detailed 2D and 3D views. I was disappointed when I zoomed super close to the Penguin Island in the San Francisco zoo and there were no cute little feathered friends. But I guess that’d be too much to ask.

A composite of three screenshots from the Maps app in the iOS 15 beat showing 3D drawings from around San Francisco. Landmarks include the San Francisco Zoo and Penguin Island.
Screenshots of the iOS 15 beta

Memories in Photos has also been updated to give you greater control over who shows up in them and what music plays in the background. You can now edit your pictures’ descriptions to create richer alt text that stays with each image as you forward them to friends. I liked using this to identify people and places in a photo for contacts who are blind or have low vision. Even though I added keywords like “sunset” and people’s names to some pictures’ descriptions, searches for those words in my iPhone’s Spotlight didn’t return those images. It would be nice, but the descriptions aren’t currently being indexed for that.

But that’s another update in iOS 15: Spotlight searches for all things in your phone will now include your photos in results, too. It uses Apple’s own machine learning to detect things in your library though, and this is still sometimes inaccurate. I searched for “Cherlynn” and “Sunset” and was shown screenshots with my name in them and an image of a red-hot map of New York from the Weather app that Apple thought was a sunset. This isn’t perfect, but at least photos are better integrated into Spotlight now.

Another update that provides better integration across iOS is the consolidation of media that your friends send you. Apple calls this Share With You, and things from your recent interactions with each person will show up there — pictures that Mat sent me of his adorable baby niece, as well as the screenshots he shared from our FaceTime adventures, were all in his page in the Phone app.

A composite of two screenshots showing the Weather app in the iOS 15 beta.
Screenshots of the iOS 15 beta

There’s still a ton more to explore not only in the public beta but in iOS 15 when the final release is ready. The Weather app has new maps that appropriately show just how scorching hot it’s been in the New York area these last few days. And we still have to test more things like Safari mobile extensions and ID and keys support in Wallet. For now, this has been an intriguing taste of what to expect in the software update. Despite a few snags, it looks like iPhone users will have plenty to look forward to later this year.



Source: Engadget – iOS 15 beta hands-on: A surprisingly complete preview

HP bets on AMD Ryzen 5000 in its new Pavilion Aero laptop lineup

HP bets on AMD Ryzen 5000 in its new Pavilion Aero laptop lineup

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On Tuesday, HP launched a new line of lightweight consumer laptops called the Pavilion Aero 13.

The newest addition to HP’s affordable home-targeted lineup sports a powerful AMD Ryzen 5000 series CPU and a 2.5k resolution display at a 16:10 aspect ratio (2560×1600) and 400 nits of brightness. It weighs less than 1 kg (2.2 lb).

AMD gets a chance to shine

Most of the concrete specifications for the Aero 13 lineup are still missing—all we know aside from the display specs and weight is that the Aero 13 begins at $749, and its maximum CPU spec is Ryzen 7 5800. We’re still waiting for details on what CPU will be in that $749 system, as well as how much RAM and storage to expect.

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Source: Ars Technica – HP bets on AMD Ryzen 5000 in its new Pavilion Aero laptop lineup

The iOS 15, iPadOS 15 and watchOS 8 public betas are here

There’s plenty to look forward to in the upcoming iOS 15 update: SharePlay in FaceTime, new Focus modes, better Maps and Weather apps, as well as deeper integration across Messages, Photos and more. Though there’s still some time to wait before the next OS officially rolls out, those eager to try early versions of these new features can check them out starting today. Apple has released the iOS 15 public beta and if you’re curious enough to install potentially unstable software, you can run it today. Additionally, Apple also dropped the public betas for iPadOS 15 (which shares many of the same features as iOS 15) and watchOS 8. Make sure you back up your data before you begin!

iOS 15 will be compatible with iPhone 6S and later (including both generations of the iPhone SE), as well as the 7th-generation iPod Touch. Those hoping to test watchOS 8 will also need an Apple Watch Series 3, 4, 5 or 6 running the iOS 15 beta. If you have compatible hardware, all you have to do is sign up for Apple’s beta program on its website here. You’ll get a notification that it’s ready to install (or you can keep looking at your “Software update” page in Settings). We’ve been using a developer beta build for a couple of days and, assuming it’s largely similar to the public beta, the software seems fairly stable with occasional glitches in specific apps. 

While your devices are enrolled in the beta program, you’ll receive updates automatically when they’re publicly available. If you’ve played around with the preview and decide you’ve had enough, you can revert to an older version by unenrolling. Once again, to ensure that your data is safe, make sure you perform a back up before getting the beta. 



Source: Engadget – The iOS 15, iPadOS 15 and watchOS 8 public betas are here