Enlarge (credit: Flickr/kennejima)

Apple has pulled the latest watchOS 3.1.1 update, after some users reported that it bricked their Apple Watch .

Unfortunate users that installed the update—which launched on Monday and promised various bug fixes—were left with watches displaying a red exclamation mark on the screen and a link to www.apple.com/help/watch. The issue appears to mostly affect the Apple Watch Series 2, although not every user has experienced problems with the update.

While it’s not yet clear what has caused the issue, Apple’s support page suggests trying to force restart the watch by pressing and holding the side button and the Digital Crown at the same time. Several Reddit threads on the update suggest that this rarely works, with many users forced to return the watch to an Apple Store, or mail it to Apple directly for fix or a replacement.