There should be an error in the memory. You should unload QQ first and then install it again to see if it is OK. If it is not OK, you can clean the machine
To confirm whether the black screen is caused by hardware failure or software failure, if the phone does not have important data, it is recommended to restore the system and try to repair it.If the recovery system still fails, the hardware will be damaged greatly!
1. Press and hold the power on key and the HOME key at the same time. The HOME key is the only key on the screen until the power on is started. 2. This recovery method is the most commonly used method to restore iPhone firmware in general unlocking tutorials. (1) Turn off iPhone; (2) Press the ON/OFF key and the home key at the same time; (3) When you see the white Apple logo, release the On/Off key, and continue to press and hold the home key until you enter the recovery mode; (4) Start iTunes, wait for it to prompt you to restore mode, then press and hold the shift key on the keyboard, click "Restore", and select the corresponding firmware to restore.
