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How To Fix Knock On Feature After Flashing TWRP

Answer
Please make a version which would not break knock on feature after flashing TWRP I lost knock on feature with stock kernel and after flashing TWRP and does not have that option of Update touch firmware in knock code settings.

Question
In dialer type 3845#*802# replace 802 with your model.
Then go to settings – upgrade touchscreen firmware. Then the Knock ON should work.

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