Hi
If you are having issues updating your Apple Watch to watchOS 3 from an earlier version, the following steps may help (try again after each):
If you have not yet done so, update your iPhone to the latest version of iOS 10 (currently 10.0.1):
On your iPhone, in the Watch app, go to: My Watch > General > Usage > Software Update - delete any update file, if one is shown.
Delete any beta profiles (on your iPhone and/or watch) and restart both devices (this only applies if you have ever participated in an Apple Beta Software Program).
Restart both your iPhone and your watch:
- Close all open apps on your iPhone:
- Double-click the Home button, then swipe up on each app preview to close it.
- Turn both devices off together, then restart your iPhone first;
Unpair and re-pair your watch: