have you perform a factory reset after updating the firmware?
I did a second hard reset watch works perfect
Good to hear you got your watch back 
Good news!
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Update, the watch worked itself out. Runs really smoothly now. No more flickering issue, Battery is also great.
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A post was split to a new topic: Wiiwatch2 freezes my phone
My kospet prime is having the same screen flicking problem 
, multiple factory resetting did not help.
With the correct firmware installed and a factory reset completed it could be a hardware issue . A loose connector inside the watch itself . If you atttempt this please be carefull