2. If it doesn't change, cclean, slim down the phone.

3. If you still restore the factory settings of the mobile phone.

4, if still, brush the machine again.

5, if still, most of them are motherboard problems. It is recommended to send it to the service station for repair.

1, the mobile phone opens the system update software, selects the menu key, and enters the rec mode.

2. When the battery is turned off (button the battery yourself), press and hold the power button and the volume button at the same time, then light up the screen and release it later.

Then enter a page, Simplified Chinese and English.

3. The power button is OK, and the volume up and down buttons are selected. There are three options in this page. Press the power button to confirm and select Simplified Chinese.

4. Select Clear Data to clear all data. After clearing, choose to restart the phone.

5. Select the nearest access system. After the phone is turned on, find, back up, open and recover all data.