Same boat here.
Found out factory reset. Power on, let go and (almost?) immediately hold power and "n" for about 6 seconds like I had read elsewhere.
I end up letting them go before the "read anywhere" text disappears.
https://classroom.synonym.com/access-factory-reset-screen-nook-tablet-17130.html
All CyanogenMod seems to be down, in favor of LineageOS?
Not sure if I need ClockworkModRecovery (CWMR) depending on which OS I want.
I see Froyo mentioned a lot, but not sure if those sources are old as well.
That being the android version 2.2 that matches what the Barnes & Noble OS is built on top of.
Found a good guide, old or not, that goes through those and ideas. I'll probably stick to SD card installation when possible and not the eMMC route.
http://androidbiits.com/barnes-nobl...d-7-1-1-nougat-lineageos-14-1-unofficial-rom/
April 8, 2017
Can't seem to find the download off their site which lists devices, but can find the names here:
https://stats.lineageos.org/model/encore
Found one here:
https://androidfilehost.com/?fid=745425885120722662
Not the latest version is seems: lineage-14.1-0407_1436-DrM-encore-udb.zip
with this being the latest I have found: 14.1-0705_1045-DrM-encore-udb
https://androidfilehost.com/?fid=673368273298947780: lineage-14.1-0414_1953-DrM-encore-udb.zip
https://xdaforums.com/nook-color/development/cm-13-0-progress-t3297152/page5
CM-13.0 Work-In-Progress
Has some installation info.
Also possibly useful 1 year old thread:
https://www.reddit.com/r/cyanogenmod/comments/69zk30/upgrade_old_nook_color_running_cyanogenmod_710/
May 8, 2017
It seems to get anything started we need adb access to install CWMR in order to install other OSes, and for that, one would need the Windows drivers for the Nook Color:
https://xdaforums.com/showthread.php?t=882751
So I am out of luck for Macs. adb root responds "Error: no devices found".
After a successful adb, some commands:
https://xdaforums.com/showthread.php?t=1078855
If I get that working, I would continue with the Rec images form the instructions in the CM13 thread, and somehow with LineageOS files. The CyanogenMod (CM) file seems easier to picture without having completed the process yet, as that is simply an image file to write directly to the SD card.
I guess LineageOS would install from zip which I'm guessing is what I need CWMR
A nice vanilla ASOP / Android install might be recommended as well, as that seems to already be ready into a format for burning directly to the SD card, and for the Nook Color to boot off of without any internal modifications or previous PC preparations:
https://www.lifewire.com/turn-nook-color-to-android-tablet-2740672
A list of ROMs with possible dead links:
https://xdaforums.com/nook-color/development
Some other old guide:
https://xdaforums.com/showthread.php?t=1941858
[GUIDE] Nook Color Installation Guide for CM7/CM9/CM10/CM10.1/CM10.2/CM11 on SD
17th October 2012