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Windows Central Question I have had other problems with it too ...it keeps trying to call people on what's app , also freezing completely until I switch it off and on again
Hard reset key sequence:
Unplug your phone
Hold vol up then plug charger. Keep holding till a ! mark appears
Leave button then press one key once: vol up, vol down, power, vol down
Gears should appear, keep phone plugged and under wifi coverage.
If still not working, last resource is a pc with WDRT and a usb cable for recovery