Apple Yanks watchOS 3.1.1 Update After It Bricks Apple Watch Devices
The issue seems to mostly affect Apple Watch Series 2 devices. Not everyone with a second generation Apple Watch who installed the watchOS 3.1.1 update ended up with a bricked wearable, though it is not clear why some have failed while others have not.
Source: Reddit (Moust4ki)
"Force restart your Apple Watch: Press and hold both the side button and Digital Crown for at least 10 seconds, until you see the Apple logo," Apple states. "If force restarting your Apple Watch doesn't resolve the issue, you'll need to have your Apple Watch serviced."
Those who have been bitten by the watchOS 3.1.1 bug say that force resetting their wearable does not work. To make matters even more frustrating, retail Apple Stores are unable to fix the problem because it requires access to the diagnostic port, which isn't performed in-store. However, affected users can request a replacement.