1. (advisable for the user)
Go to main menu-> Settings -> Advanced system -> Reset options -> Clear all data (factory reset -> Delete all data -> Delete all data
2. (not advisable for the user)
The hard reset with the power and volume button is the least advisable, the phone is put in Recovery mode and if it is done incorrectly and / or the phone has a problem, it may not turn on again.
1) Turn off the device, press and hold «Volume up» key + «Power» key until LCD light turns on to enter recovery mode;
2) Press «Volume» key to select «Wipe data / factory reset» and press «Power» key to confirm
3.
The phone is put in test or manual test mode, It will not damage the phone, but it is not advisable.
With the phone switched on, press the sequence * # 2886 # -> menu -> factory reset
Make a backup of the terminal if possible and a hard reset of it.
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