I just had the same issue (it kept saying my password/email was not correct) when I reset my tablet. I was going to change my password, then I noticed that I had several email from Amazon, stating that they now have a 2 step authentication process for the 1st time you register a device. The email contained a 6 digit number that I needed to put in the "password" box & it worked fine. My problem is that now I cannot access the app store. I have access to music, and books, but I need the app store app, so I can download the movie app to be able to download my amazon movies on my android tablet. It worked fine on my cell phone, but will not work at all, on my tablet, and that was after a complete factory reset.