What if after you root your NOOK you decide you’d like to go back to the NOOK software instead of Android? You may be able to do it. Again, do an Internet search. Some people have reported success using an Android app called NOOK Tablet unrooter. You download the app and then use it to unroot the NOOK. You can find instructions and a file to download here: http://forum.xda-developers.com/showthread.php?t=1380235. You can find another way to do it here: http://www.addictivetips.com/mobile/unroot-nook-tablet/. Again, though, keep in mind that when you root your NOOK, you may or may not be able to unroot. When you unroot, you’ll generally lose all the data on the device.