LG D955 Guide De L'utilisateur page 546

Important notice
5. Using the Hard Reset (Factory Reset)
If your phone does not restore to its original condition, use a Hard Reset (Factory Reset)
to initialize it.
1 Turn the power off.
2 Press and hold the POWER/LOCK Key + VOLUME Down Key on the back of the
phone.
3 Release the POWER/LOCK Key + VOLUME Down Key when the LG logo is
displayed, then press and hold the VOLUME Down Key + VOLUME Up Key again.
4
Release all keys when the Factory hard reset screen is displayed.
5 Select Yes using VOLUME UP/Down Key and press the POWER/LOCK Key to
continue or select No using VOLUME Up/Down Key and press the POWER/LOCK
Key to cancel.
6 Select Yes using VOLUME Up/Down Key and press the POWER/LOCK Key
once more to confirm or select No using VOLUME Up/Down Key and press the
POWER/LOCK Key to cancel.
WARNING
If you perform a Hard Reset, all user applications, user data and DRM licenses
will be deleted. Please remember to backup any important data before
performing a Hard Reset.
6. Opening and switching applications
Multi-tasking is easy with Android, you can keep more than one application running
at the same time. There is no need to quit an application before opening another one.
Use and switch between several open applications. Android manages each application,
stopping and starting them as needed to ensure that idle applications don't consume
resources unnecessarily.
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