I got the similar problem on my nook hd (version : CM10.1). Someday, it automatically upgraded and i interrupt it, then a tragedy comes. It always get into cyanboot and recovery 188.8.131.52 when i rebooted. And i try flash newer CM, but it always reboot. Then i try many ways during several days.
When i just wanted to give up, the miracle showed. My nook was connected on PC with internet, the screen is stuck on cyanboot as usually. Then new screen pop up to ask me set language.
I quickly flash recovery, CM11 and google market. In this time, recovery 184.108.40.206 was worked but i didn't why and how. BUT when i reboot it, it still went into cyanboot and recovery 220.127.116.11. In recovery menu, i try advanced-->reboot to bootloader
. Yes, i got into new CM11
Now, although my nook get into recovery 18.104.22.168 when it rebooted, but tap advanced-->reboot to bootloader, which get 100% into CM11.
It really a tough work, and i still don't know how i solve it~~