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Try holding the on/off key down for about 10-20 seconds and check if you're able to reset it.
If you're able to turn it off I suggest that you try to reinstall it using SUS.
Mine after update has all the time vibration on.Although i did a factory reset ,when the phone rings ,the smartwatch 2 always vibrates.
I seem to have the same vibrating issue after the update. Ideas?