Please check and CONFIRM your existing version before you flash!!!
Posted here /thread/2884/kw88-pro-android-7
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Remember these things:
You cannot flash this firmware on the previous KW88 that is non-pro model.
You cannot flash the BT Calling firmware on to the KW88 Pro.
Please check your screen type before flashing - there will be letters like HEHUI or NHH or OHH in the firmware version details in your watch settings/About Watch
There are around 4 different screen types on the market so be careful !!