I installed CM11 to an SD card (as I was nervous of altering my nook) using bokbokan's excellent instructions. Initially it seemed fine but this morning it was unexpectedly out of battery and will no longer boot.
The symptoms are similar to this: http://forum.xda-developers.com/show....php?t=2611769, this: http://forum.xda-developers.com/show....php?t=2736347 and this: http://forum.xda-developers.com/show...2649061&page=2 except that the posters there had previously replaced the stock software and overwritten the emmc.
When the SD is in, it locks up on the Cyanoboot screen, when the SD card is out I only get to the black screen with 'Nook' on it and no further. It looks like the SD install has messed something up on the internal emmc. Hard resets and multiple failed boots don't appear to help.
I can occasionally (but not always) get it to reboot to CWM recovery by reinserting the card and holding down N and lock, but I get a lot of errors such as "E:Can't open /cache/recovery/last_log", "W:failed to mount /dev/block/platform/omap/omap_hsmmc.1/by-name/cache on /cache failed:No such file or directory" and "I:Can't partition non-vfat: /emmc (ext4)". When I go to 'Mounts and Storage' in CWM, I cannot mount anything (e.g. "Error mounting /boot!").
I chose to go down the SD card install route (using ) in order to avoid touching the stock install on the emmc, but now the whole thing is dead.
Reading other threads, it sounds like either:
1. The emmc is bricked due to some firmware bug. The impression I get from reading around is that CM11 was supposed to incorporate a workaround for the issue. If the emmc is the problem, I have to return the Nook and hope to get a working one.
2. The emmc has (somehow) become corrupted, I have to put a different version of CWM on my SDcard (so it will install to the EMMC rather than the SDcard, and because CM11 uses a different version), using the instructions here: http://forum.xda-developers.com/show...php?p=35811322 and then reinstall a stock rom to my emmc. I then have to reregister the Nook (not sure if this is essential) before being able to use my CM11 SDcard install again.
If it is the first problem, I would like to know how I can check to see if the emmc is indeed broken.
If it is the second, I would be grateful for any help in understanding how and why the SD install has messed up the emmc, and whether the steps above are likely to bring it back to life.