LG LG G Pad 8.3 User Guide

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Release all keys when the Factory hard reset screen is displayed.
Press the
Power/Lock Key to continue or either of the Volume Keys to
cancel.
Press the
Power/Lock Key once more to confirm or either of the Volume 
Keys to cancel.
Your device will perform a hard 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.
5.  When the screen freezes
If the screen freezes or the tablet does not respond when you try to operate 
it: Press and hold the Power/Lock Key   for over 8 seconds until the LG logo
is displayed to restart your tablet. If it still does not work, please contact the
service center.