BN Nook Simple Touch/Replacing system files
To replace system files on the Nook Simple Touch (for example, /system/framework/framework-res.apk):
From the command line:
adb push framework-res.apk /[a directory other than /system/framework, i.e. /sdcard]
Now, using a file explorer on the Nook, copy and paste the framework-res.apk file into /system/framework. If asked if you want to overwrite, tap "Yes". Your Nook will insta-reboot itself directly after replacing this file, booting into the new framwork.