My Nook HD+ is in a bootloop. How can I fix this?

[AC Question]

I had TWRP on my Nook HD+ and decided to upgrade TWRP so I could install CM11 on the tablet. When the tablet rebooted it got stuck on the Cyanoboot logo, so I restarted the tablet. Now when I turn on the tablet, it shows "nook" restarts until the battery dies only to show the initial "nook" logo screen. I have spent hours upon hours on forums with no success.