I can help you with wiping clean and starting over, but not on getting CM11 going.
Go to my NC tips thread linked in my signature and make a new bootable CWM SD per item A10 (the 6048 version you have now will not work). The follow item A15 to get stock back. Remember to use the formatting zip there too.
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