[Nook Touch Android Development] ZenM:
I strongly recommend ya to read the thread is not that long, and heed all warnings :

4.2 - Noogie
SOURCE=http://xdaforums.com/showthread.php?t=1142983
NOTE1="What Noogie does is to grant access the Nook's disk thru USB, following instructions are to make a full drive image."
NOTE2="Noogie does not seam to have a Power Off or Exit option one must first unmount and eject then disconnect. Press the Nook's Power button to restart, one might need to press it more than once and for up to 20s, if done correctly the screen will flash doing like a negative image. Remove the SD Card then hold Power to restart it yet again, and lastly if needed turn it off again from the Nook's OS."
NOTE3="Backup Image Size for Nook Simple Touch Glowlight Firmware 1.2.0 or 1.2.1 MUST BE 2000683008 bytes."
4.2.1 - Burn noogie.img to SD Card.
4.2.2 - With the Nook turned off insert SD Card.
4.2.3 - With the Nook turned off connect to the PC.
4.2.4 - Make the Image, any software may be used:
Windows:
4.2.4.1 - Roadkil Disk Imager > Tab Store Image:
4.2.4.1.1 - Choose the correct physical disk holding 1.86GBs, do not pick a unit by its drive letter.
4.2.4.1.2 - Choose the save path.
4.2.4.1.3 - Press Start.
Linux:
4.2.4.2 - dd:
4.2.4.2.1 - Find the Nook's dev, sudo mount or sudo df -h or checking under /dev, sdb will be used as the dev address.
4.2.4.2.2 - sudo umount /dev/sdb*
This is not the same as ejecting the drive with KDE.
4.2.4.2.3 - dd if=/dev/sdb of=noogie_1.2.1.img bs=1M

4.2.5 - Make a shasum of the .img and compress both files.
4.2.6 - Reset Nook, see 4.2 NOTE2.

4.2.7 - Restore Nook
Linux:
4.2.7.1 - dd:
4.2.7.1.1 - Follow steps 4.2.1 to 4.2.3.
4.2.7.1.2 - Find the Nook's dev, sudo mount or sudo df -h.
4.2.7.1.3 - sdb will be used as the dev address.
4.2.7.1.3 - sudo umount /dev/sdb*
This is not the same as ejecting the drive with KDE.
4.2.7.1.4 - Uncompress and verify the .img file.
4.2.7.1.4 - dd if=noogie_1.2.1.img of=/dev/sdb bs=1M
4.2.7.1.5 - Restart Nook, see 4.2 NOTE2.

10 - Cyanogenmod 11
SOURCE1=http://xdaforums.com/showpost.php?p=60453540&postcount=74
SOURCE1_INFO="Last edited by kfazz; 1st May 2015 at 12:52 AM. Reason: re-uploaded with encore_merge kernel (also for recovery)"
NOTE1="
Updating:
overwrite uImage-recovery and ramdisk-recovery.img on sdcard
flash zip
Fresh install:
write sd.img from sd2.zip to sdcard (try win32diskimager if you're on windows)
copy zip and md5 to /media, reboot with sdcard in, install rom using twrp,
reboot into android.
"
NOTE2="By default the ROM is installed in the SD card."
NOTE3="The following instructions use sd2.zip from Test Build 2 to install Test Build 3.
10.1 - Copy CM11 zip and md5sum files to /media, can be done thru ADB mounting media as rw or using Noogie or even the original OS mounting the USB partition labeled as "NOOK".
10.2 - Burn sd.img to an empty SD Card.
10.3 - With the Nook turned off, insert SD card and boot, one might need to boot twice, ie. pressing power button if stuck, depending on the ROM one might need to hold both Bottom Page Turn buttons for some seconds then releasing as if entering Recovery Mode.
10.4 - Once on TWRP recovery > Mount > media
NOTE="Only mount media, do not change the state of other partitions."
10.5 - Install zip (ex: cm-11-20150511-UNOFFICIAL-zoom2.zip).
10.6 - Reboot with the SD Card, might need to boot twice.