I purchased this tablet many years ago (~2012?) and after original setup only used for a few days. The tablet turned out not to be the convenient device I thought it would be for my purposes. I am now trying to fire it up after all these years but cannot get passed the long ago forgotten login password. I would appreciate help in how to do a hard reset on this device. I have tried hold down volume + and power key but that does not seem to work. The only hardware keys on this device are volume + and - and a camera key as well as pinhole reset switch. If no key based hard reset can I remove the back an then remove a battery. Thanks.