LG D415 - Manual (Page 11)

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Warning! If you perform a Hard Reset, all user applications and user data will be
deleted. Please remember to back up any important data before performing a
Hard Reset.
1 Turn the power off.
2 Press and hold the Power/Lock Key + Volume Down Key on the phone.
3 Release the Power/Lock Key only when the LG logo is displayed, then
immediately press and hold the Power/Lock Key again.
4 Release all keys when the Factory data reset screen is displayed.
5 Press the Volume Key to scroll to the desired option, then press the
Power/Lock Key to confirm.
6. Using Safe Mode
To recover your phone when malfunctioning.
1 Turn off your phone and reboot. When you see the T-Mobile animation
press and hold the Volume Down Key until the phone reboots. Your main
screen will then be displayed with the words “Safe mode” in the lower left
corner.
2 From the Home screen, tap the Menu Key and tap System settings >
General tab > Apps.
3 Tap one of the available tabs at the top of the screen and select the application
you wish to uninstall.
4 Tap Uninstall and OK to confirm.
5 After uninstalling the application, turn off and reboot your phone.