MCKIDNEY: tak kdyby nekdo potreboval taky, tak zde :)
1 Turn off the phone.
2 Press and hold the Volume Up key and the Home key, then press and hold the Power key.
3 When the device logo screen displays, release only the Power key.
4 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).
5 Press the Volume down key several times key to highlight ‘wipe cache partition’.
6 Press the Power key to select.
7 Press the Volume down key to highlight ‘yes’ and press the Power key to select.
8 When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
9 Press the Power key to restart the device.