External reset
1.
Charge your battery 30% or more.
2.
Turn off the phone.
3.
Press and hold the Volume Down button and the Power button at the same time until the phone turns on.
4.
Press the Volume Down button until you see Recovery mode.
5.
Press the Power button to restart in Recovery mode.
6.
Use the Volume buttons to scroll to
Wipe data/factory reset
, then press the Power button to select it.
7.
Use Volume buttons to scroll to
Factory data reset
, then press the Power button to select it.
Allow several seconds for the reset to complete.
8.
Use Volume buttons to scroll to
Reboot system now
, then press the Power button to select it.
Allow several minutes for the reboot to complete. If the phone doesn't finish rebooting, press & hold the Power
button until the screen turns dark, then release it to power up normally.
9.
If you reset your phone because you suspect a third-party app is causing problems, when you set up the
phone again, be sure you don't copy all apps. Then,
one app at a time and use the phone for a while. If
the phone has no issues, install the next app and retest.
Get more help
Issue
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Fix a problem : Maintenance procedures
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