[Nook HD, HD+ Android Development] Diogenes5:
It took me a couple of hours to figure out how to reinstall everything again as I hadn't done it in a while and the OP references another post and its not entirely clear even in that post what to do with what so I'll post a short write-up on how to install this.

Image Files - You burn this to the SD card either with win disk imager (search source forge) or the linux equivalent. It is confusing because the original image file used to burn CM 10 or 10.1 was around 150 megs or so and the zips themselves are only 10 megs or so. Unzipped they become about a little over 100 megs which makes more sense if you installed an image before.

Rom Files - You place this somewhere on either the internal memory or the SD card. These files are about 150 megs. It is confusing about where to put this since in the original image, there was enough room to put the rom zip in the boot partition but these newer images are smaller and dont have enough room. You either transfer the rom to the other partition (which windows cannot see using an SD card reader) or on the Nook itself. My solution was to place the file on the nook internal storage (booting to nook official firmware first and then turning on MTP under storage in settings). You will have to flash this file in order to have a working install.

Update Files - The updates listed are unzipped into the boot directory and create new boot files (replacing older ones) in order to achieve the dual-boot hybrid setup. The only way you see boot files is by taking the micro SD card out of your nook and putting it into an SD card reader and browsing through windows (This must be done after you've written the image file to your sd card). The boot partition is the first partition so windows will see it. From there unrar or unzip the most recent update to your boot directory.

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Instructions to install this Rom:

You will need the latest rom here: http://xdaforums.com/showthread.php?t=2063968 As of February 4th, the latest rom is labeled

You will need the latest image file from the OP of this thread. Currently the title is

You will also need one update at the moment from the OP of this thread. Currently the title of that update is

You will also need Gapps: http://goo.im/gapps/gapps-jb-20121212-signed.zip

1) First plug in the microsd card you plan to use as a boot sdcard into your computer's card-reader. Extract the zip file sdcard-cwm-hummingbird-hybridv2.zip. Inside will be an image file a little over 100 megabytes in size. Use an image-writer such as Win Disk Imager to burn this image to your sd card. Be careful about which drive, you may accidentally overwrite a harddrive if not careful.

This will partition your sd card into a small boot partition (About 120 MB) and a large unformatted storage space (unpartitioned and the remainder of your SD card).

2) Next you will need to update the boot files. Extract the update zip listed above directly into your boot directory. It will ask if you want to overwrite. Click yes.

3) Plug the micro sd into your nook hd. Power it on. The program will automatically format your sd card among other tasks.

4) Next you will need to install a rom. To do this you need the rom zip. Your nook hd micro sd card will only boot to recovery for now. If you use linux, you can simply place the rom file I listed above and the update file I listed onto your micro-sd card's storage partition. Being a windows user, I used the Nook HD's internal memory instead after booting into the official firmware and turning on MTP. I copied the rom zip file and gapps file over, turned off my nook, put in the boot card, and then turned on my nook again.

5) In recovery chose to install update and choose zip. First you will install the rom zip. This will take a little bit of time.

6) Wipe cache and dalvik. Now install gapps.

7) Wipe cache and dalvik again. Reboot.

Optional: 8) Install one of leapinlar's fixes from this post: http://xdaforums.com/showthread.php?t=2097731&page=4

Specifically, the

as that will mount media to the storage space of your micro sd which should be larger than the internal emmc.

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You will now have CM 10.1 hybrid with dual boot. I installed leapinlar's sdswap fix (listed earlier in this thread) after these steps so that the OS would use my micro sd card as storage for media which has worked out great. Spotify, Pocket, and other programs download directly to my sd card instead of the internal emmc (which is used solely for program data). I now have a 72 gigabyte tablet/reader. Suck it Nexus 7 users :P (jk, that's a great device too).

Edit: Somebody asked me what card I used. I used a Sandisk Class 10 UHS-1 64 gb micro sd card. I think it's the only one of its size available in the US right now and it's currently on sale for 47 on amazon. I am currently using another one on my transformer infinity and it works like a champ. Anything from Samsung and Sandisk has worked well in my experience as they are themselves oem's of solid state chips.