Why does Konka mobile phone display that it can't be turned on without instructions after the system upgrade?

① Unplug the battery and reinstall it to see if it can be turned on normally.

(2) Whether it can enter recovery. How to enter the recovery: In the power-off state, press and hold the "Volume Increase Key" first, then press and hold the "Power-off Key", and let go to enter the recovery after the boot screen appears. If recovery is possible, please switch the system to the recovery state and back up the data. If you can't succeed, you need to clear all the data (address book, SMS, mobile phone application will disappear).

③ Whether you can enter Fastboot. Method to enter Fastboot: Press and hold the "Mi key" and then the "Volume reduction key" and then press and hold the "Shutdown key" when the boot screen appears, let go to enter Fastboot. Please connect your mobile phone to your computer and brush a complete system package with Miflash.

④ If this is still the case, it is recommended to enter the after-sales process to detect the fault of the mobile phone.

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