Here’s how you can root Barnes and Noble E-reader Nook. It’s based on Android and the OS is stored in the SD card. To root the Nook, you simply have to extract the SD card from Nook then enable the shell.
I guess this is rather simple, not a real hack but still, you can do a lot of stuff once you root your Nook.
1. Turn off nook 2. Take off the back cover of the nook 3. Remove the battery 4. Remove the user microSD card if there is one 5. Unscrew all screws. Dont lose them. There is a hole in the bottom left with