LG LGL39C - Manual (Page 10)

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5. Using the Hard Reset (Factory reset)
If your phone does not restore to its original condition after an error or you forgot your
screen lock, 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 .
3 When the Factory Hard Reset welcome screen appears, release all of the keys.
4 Press the Power/Lock Key to continue or any other key to cancel.
5 Press the Power/Lock Key once more to confirm or any other key to cancel.
6 Your phone will perform a factory reset.
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 because 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.
To stop applications: