I suggest starting here: http://forum.xda-developers.com/forumdisplay.php?f=1050 http://forum.xda-developers.com/forumdisplay.php?f=1050 I don't have a 10.1, b

I suggest starting here: http://forum.xda-developers.com/forumdisplay.php?f=1050 http://forum.xda-developers.com/forumdisplay.php?f=1050 I don't have a 10.1, but I did spend a few hours reading through many of those threads last week before I decided against purchasing one for my wife. (We ended up going with the 7+ model instead.) For what it's worth, my understanding is that there are workarounds to flash an unsigned kernel, it's just a real pain. Also, I think you would get the message you are seeing even if it were unlocked... my Galaxy S2 gives me the same warning before letting me into download mode.