I was using CM10.1.3 emmc with CWM latest version as suggested in the respective thread. I have installed a SD formatter app from Google Play and tried to format my 32GB Class 10 Samsung MicroSD card inside the device. After that, the sd card was non writable. So I tried to restart the device, but alas, it got stuck in the 1st Black screen with the big Nook. Not even able to boot into CWM. Even the CyanogenMod logo didn't come.
I have a bootable CWM (6.0.28) recovery MicroSD card (8GB Class 4) and used it to boot into recovery, cleared Cache/ Factory reset, Dalvik Cache and then again flashed Carbon unofficial 4.3 JB rom and Gapps for JB 4.3. But it still getting stuck in the 1st Nook screen.
After reading a lots of thread here, it looks like that during the format of SD card, it somehow destroyed the proper partitions of the emmc. But unlike others mentioned in different Bricked Nook HD thread, I am able to access each components of emmc when booted from CWM Bootable card, able to mount internal storage etc.
So, is there a solution to restore the emmc partitioning properly? I tried to connect it to PC for connecting it through adb but didn't have the proper usb driver for it. The driver I got, needs the hardware id of the product to modify the inf file which sadly I can't access in the device.
I also tried to restore it to stock 2.2 rom from the CWM backup created earlier before installing CM10.1.3. It got restored but didn't solve the problem, it still getting stuck into Black screen with Nook written to it, the one comes before CM logo.