I purchased 2 v712 tablets about 1 month ago. One works fine - battery lasts about 3 hours while playing and the other only lasts 1 - 1.5 hours. When I got them I flashed both with instructions found on your site. I can return tablet with the bad battery but they state they will not honor the warranty if the tablet has been flashed. Is there a way to "unflash" the tablet to make sure they will honor the warranty? I do not believe the flashing had anything to do with the battery problem. Thank you for your help.