I have a M3C91-8GB-1a-H3-sa095 ( A friends) How do I do a factory reset? My friend gave it to another of his pals for a loan and he put a password on it when he was drunk, now he can't remember it. So I have to do a factory restore. Normally with Android tablets you hold down the VOLUME + and ON at the same time but it just wants to do an upgrade from TF. Is that the only way to do a restore? Surely not. Also I can't find a rom image to download to put on a TF card. I know it's Android 4 that's on it. Will another Rom image do? Thanks in advance.