1) Download the firmware and rename the file m201-ota_5066.zip to m201-ota.zip and put it in root your microSD slot (I don't know If it will work on USB drive, you have to try and see): http://festyy.com/q5jKTO
2) At your home screen of TVPad4, On the remote control enter 200981811 and the update screen should pop up. It will reboot and update the firmware.
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