Apple on Tuesday pulled watchOS 3.1.1, following complaints that the software is bricking some Series 2 Watch models. The update, which was released yesterday, includes support for new Unicode 9.0 emoji, some customization features, and more.
According to the complaints, after installing watchOS 3.1.1, affected Apple Watches begin displaying a red exclamation point and the URL www.apple.com/help/watch. A force restart does not fix the issue, and these Watches will likely need servicing.