We’ve seen the Nook Tablet rooted before, but this has to be the easiest process out there. All you need is a 2GB SD card, a computer that runs Windows, and a Nook Tablet with tablet software version 1.4.1 or earlier.
https://gizmodo.com/nook-tablet-rooted-android-free-for-all-coming-soon-5861258
The detailed instructions are posted on the XDA Developers Forum, and we’ve got to admit that the 15 steps are pretty straightforward even if you’ve never rooted a device before. While there are a few more steps involved, here are the basics: You simply copy a few files to an SD card, pop the SD card into your Nook Tablet, reboot the device, and just like that, you’ve got a regular Android tablet complete with Google apps and the Android Market. [XDA Developers via The Verge]