Answer to: Why wont the tab recognize my fingerprint or backup passwordThis is an interesting one. On a brand new (one week old) Tab S 9.7 neither the fingerprint nor the backup password were recognized by the tablet. Neither could I log in using the Google account (Gmail). So I logged into the Gmail account on a PC and it worked fine. Still nothing on the tablet. I changed the Gmail password on the PC and was then able to log in on the tablet using the Gmail account and the new password. Finally I added a new fingerprint ID and all is back to normal for the moment. It's like the tablet is holding vital data in a cache of some sort and the OS is "allowing" it to make incorrect assumptions based on what appears to be corrupt or otherwise incorrect data. Definitely one for Samsung's (or Google's) coders to sort out, as without the PC I would have had to do a factory reset of the tablet. Not at all appropriate.