Android 13 started rolling out to Google’s Pixel devices this week, but some users are dismayed to find this is a one-way upgrade—after installing Android 13, you cannot go back to Android 12 on the Pixel 6, 6 Pro, or the new Pixel 6a. While this seems antithetical to the openness of Pixel smartphones, this comes from a commitment to security.
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Source: Hot Hardware – Android 13 Is A One Way Trip For Pixel 6 Owners Due To Android 12 Bootloader Vulnerability