Try restoring your new backup. There is a flag in /bootdata that needs to get reset so it boots to the ROM instead of recovery.
If that does not work, go to my HD/HD+ CWM thread linked in my signature and make a new bootable CWM SD per item 1a and use that to flash the plain stock zip from item 6. Follow that with a factory reset. That should make it bootable again.
If you saved your CM11 backup you may be able to put TWRP back and restore CM11.
Sent from my BN NookHD+ using XDA Premium HD app
See my Nook Color Tips Thread here
and my Nook Color EMMC Partition Repair Thread here
and my Nook Color Updated CM SD Installation Instructions here
and my Nook HD/HD+ stock tips thread here
and my Nook HD/HD+ CWM Root Tools thread here
e.mote's Nook HD/HD+ Dummies Guide for installing CM10.1/CM10.2/CM11 here