Wipe cache partitionTurn off the device.Press and hold the Volume Up&
nbsp;key and the Home key, then press and hold the Power 
;key.When the device logo screen displays, release only the Power
key.When the Android logo displays, release all keys ('Installing system
update' will show for about 30 - 60 seconds before showing the Android
system recovery menu options).Press the Volume down key several
times key to highlight 'wipe cache partition'.Press the Power key
to select.Press the Volume down key to highlight 'yes' an press
the Power key to select.When the wipe cache partition is complete,
'Reboot system now' is highlighted.Press the Power key to restart
the device.