It is recommended to try the following steps:
1. The machine is fully charged and the data is backed up, then it is turned off (OFF).
2. Press and hold the [Power button] and [Volume] button for 10 seconds. After entering Recovery mode.
3. Operation 2-wipes
(1). Select?wipe?data/factory?reset;?Select?wipe?cache partition
(2 ). Select the "reboot" system "now" operation and then restart, and you're done.
4. If the problem is not solved after 2-wipes. ?
5. It is recommended to press and hold the [Power button] and [Volume-] button for 10 seconds. ?
6. Enter Fastboot mode and connect to PC. Wire brush the official Rom repair system.