2. Start the recovery mode while pressing the power button and the volume (Volume +). Moving through the menu by using the volume control buttons (Volume - and +), selection of menu items - pressing the power button
3. Select «apply update from / sdcard». In the contents of the memory card, select the update file and press the power button to begin the update
4. The update process will be displayed on the screen
5. At the end of the process you will see the inscription «Install from sdcard complete». Restart the tablet selecting «reboot system now»
6. Check the version of software in the System Information
(credits to synergy84)
