Guide from the net:
You need to set you phone into english language with USA region, than restart. Charge you watch until full and then do a factory reset: hold down both roll and a key for 10 sec. After welcome screen select “i”, then select english language and USA region. Type “start paring” than select “i”. On the screen you will see the unique number of your watch. On the iphone open watch app and select “start pairing”, than type manual and select you iwatch from the list. Wait for a code on you iwatch, than type it into phone. Set up as new.
You need to set you phone into english language with USA region, than restart. Charge you watch until full and then do a factory reset: hold down both roll and a key for 10 sec. After welcome screen select “i”, then select english language and USA region. Type “start paring” than select “i”. On the screen you will see the unique number of your watch. On the iphone open watch app and select “start pairing”, than type manual and select you iwatch from the list. Wait for a code on you iwatch, than type it into phone. Set up as new.