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ROM flashing tutorial reference:

You can flash by USB cable no need for recovery. Please choose ” Firmware update” when flashing.

You’d better conduct factory reset and wipe cache partition first .  Back up your phone before factory reset. If there are some errors during flashing, you can flash official rom first and then try again.

Known bugs:
Videos taken by the phone cann’t  be saved, but it can be solved to install a 3rd party camera APP.
Any other bugs, please reply here: