ADVANCED FIRMWARE UPDATE
Unzip file in your desktop as is.
Connect both pc and device with the USB cable.
Power off the device.
Note: Under W7, this tools must be run under administrator permission. Do do this you need to right click the RkAndroidTools.exe icon and select RUN AS .
Press volume (+) button and don’t release it. Then press the power button.
Release button as soon as the square #1 turns green.
Install windows driver according your OS.
Choose firmware: UPDATE.IMG
Click “Upgrade” to upgrade your device. It takes about 10 minutes to complete. You will see a flashing yellow box during reprograming. Do not interrupt.
When finish, you will get this message:
After you see the recharge battery screen, you may disconnect the USB cable.