Wipe the cache partition:

1. Hold power button and select 'Power Off'

2. With device off, hold 'Volume Down' button and press power button. An image of an Android lying on its back will appear.

3. Press the Volume Down key twice until "Recovery mode" appears on the screen.

4. Press the Power key to restart in "Recovery mode." An image of an Android with a red triangle will appear.

5. While holding down the Power key, tap the Volume Up key.

6. The Android System Recovery screen will appear. Release all keys.

7. Use the Volume keys to scroll to wipe data cache partition and press the Power key to select.

8. The device will restart.