Apple has pulled back the watchOS 3.1.1 update following complaints from Apple Watch Series 2 owners about their smartwatch bricking with the update. Don’t update to watchOS 3.1.1 right now, wait for apple to fix the issue. Be noted that, if you use the Watch app on your iPhone to try and update your Apple Watch, the latest version that will show up will be watchOS 3.1, and not 3.1.1.
Apple has not acknowledged the issue yet, but owners of the now bricked Apple Watch Series 2 owners have no other workaround to fixing their watch other than sending it to Apple. Going to an Apple Store will not be enough to bring your Apple Watch back to life since the OS will now need to be flashed using the diagnostics port, which Apple’s retail stores don’t have access to.
Apple will likely release an updated build of watchOS 3.1.1 once it fixes the bug. Until then, there is not much that you can do. And if you own a bricked Apple Watch Series 2 now, you should head send it over to Apple because the chances of reviving it without accessing its diagnostic port are bleak.