I was unable to boot to stock without removing the SD-card. An older version of flashing_boot.img on the SD-card allows me to boot to stock.
I made a bootable SD-card using Succulent's cm_acclaim_11.0_01OCT2014_HD_SDC.zip. I used the MLO, u-boot.bin, and flashing_boot.img from the zip's root directory in the boot partition of my SD-card. My Nook Tablet would boot from the SD-card, I would get Cyanoboot, and I was able to SDC boot into Kitkat. When I tried to "INT boot" to the stock system, the screen would hang on "Read Forever" (never gets to "nook by Barnes & Noble").
The flashing_boot.img from post 100 of this thread, and the one from succulent_boot.zip, both allow me to boot to stock without removing the SD-card. They both display dates (at the bottom of the Cyanoboot screen) earlier than that displayed by the one from the CM11 zip.
I don't see any mention in this thread of a bug that was introduced and later fixed.
Code:
flashing_boot.img
from cm_acclaim_11.0_01OCT2014_HD_SDC.zip
Thu Feb 6 19:43:36 2014
boot to stock hangs on "Read Forever"
(never gets to "nook by Barnes & Noble")
boots to SD
from XDA thread Say hi to "CyanoBoot" post 100
https://xdaforums.com/showthread.php?t=1522226&page=10
link https://dl.xda-developers.com/1/2/9/1/1/7/1/flashing_boot.img?key=Uh_dTxbbaqL03aFHh5rICw&ts=1516415905
ALPHA Sat Feb 18 07:51:59 2012
boots to stock
boots to SD
from succulent_boot.zip
Wed Jan 9 16:53:13 2013
boots to stock
boots to SD