Rooting and Re-Imaging

Note that YOU WILL BE ERASING EVERYTHING on the internal memory of your Nook. Yes, all your and Barnes & Noble's data will be gone. Again, turn back now if you aren't comfortable with that.

PREREQUISITE: Download Listed Files for Desired System:  

  REQUIRED FOR ALL: WinImage
  REQUIRED FOR ALL: ClockworkMod 3.2.0.1**
  RootKit for B&N Software Versions greater than 1.1: File 1 and File 2

  Gingerbread:  OS | Google Apps 
  Honeycomb: OS | Google Apps
  Jellybean: OS | Google Apps

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**NOTE**

No matter WHAT the current version is, you must use the above ClockworkMod version (3.2.0.1).

If you has previous download or used any other version of ClockworkMod, you MUST use the above version.  Otherwise the "data" partition will not re-format and instead will say "Error formatting data!"

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1. Install the WinImage Trial. There is no need to register.  The trial version is fine.
   
   
2. Extract the ClockworkMod zip file ONLY. (Do not unzip any of the other downloaded files.)  It should contain one .img file.
3. Open WinImage. (Windows 7 (and greater) users should use the "WinImage (administrator)" Shortcut)
4. Go to WinImage menu “Disk” and select Use Disk X: where X: is your micro SD drive. Replace X: with whatever drive letter Windows assigned for your SD card.
   
5. Go to the WinImage "Disk" menu and select Restore Virtual Hard Disk Image on physical drive…It will prompt you to select a physical drive from the list. Select your microSD one.
    
6. Click OK, it will open a dialog prompting you to select the actual image. Change selection to "All Files (*.*)". Select the .img file you just extracted and follow the instructions to write the image on the micro SD card. Click "Yes" at the message. 
    
7. Using Windows Explorer, copy the rest of the ZIP files you previously downloaded to the microSD Card. Four files in all.
    
8. Power off your Nook, insert the SD, and power on. You're now in ClockworkMod Recovery. Use the Volume up/down to move up/down through the menu. Press the Power button once to go back.
9. Select "Install zip from SD card"
10. Then "choose zip from SD card"
11. Select the file manualnooter-4-5-18.zip.
12. Once complete, select "choose zip from SD card" again.
13. Select the file manualnooter-4-6-16.zip.
14. Once complete, press the power button once to return to the main menu.
15. Highlight the restart option.
16. Remove the microSD card.
17. Press the "n" button to restart.
18. Your Nook should restart like a normal every Nook. However, now, it's ROOTED!
    To completely loose the Nook software altogether, we can reimage it with a new OS that you have already downloaded.
     
19. Power off your Nook, insert the SD, and power on to return to ClockworkMod Recovery.
20. Under "mounts/storage," choose format system, then format data, then format boot IN THIS ORDER!
     
21. After formatting, select "Install zip from SD card," then "choose zip from SD card," and select the appropriate file:
    
      Gingerbread: cm-7.2.0-encore.zip
      Honeycomb: HC-v4-emmc.zip
      Jellybean:  cm-10-20121205-encore.zip
22. Wait for the process to complete - it MAY take a while, or it MAY be really quick.
23. Once completed, choose another zip and install the Google Apps file:
      Gingerbread: gapps-gb-20110828-signed.zip
      Honeycomb: HoneyGApps.v2.zip
      Jellybean:  gapps-jb-20121011-signed.zip
     
24. Power off your Nook.
25. Remove your microSD Card.
26. Turn on your Nook.

The selected OS is now installed and functioning!

I advise you to put the MicroSD card back into the Nook and reformat it under Settings prior to installing any new additional apps.



Stolen from Me and:
http://forum.androidcentral.com/barnes-noble-nook-color/58530-how-flashable-zip-install-honeycomb-internal-memory-emmc-nook-color.html