Turn off the phone first. Some mobile phones that need a power-off password can be operated after power consumption is automatically turned off and charged.
Then press and hold the volume+button and the power button at the same time. After about ten seconds, the phone will enter recovery mode.
After entering recovery mode, select Clear all mobile phone data. This option is equivalent to restoring the factory settings.
After the mobile phone is cleared, it can be used by turning it on directly.