Recover a Nook Password
Nook users can enable a pass code to prevent unwanted access
to the device.
If you forget your device pass code, you won't be able to
recover it.
You can reset your pass code and create a new one by using
your Barnes & Noble account credentials.
Attempt to input your pass code three times.
Once you have failed to unlock the Nook three times, you
will be prompted to "Start Over" or "Disable pass code using account
credentials."
Tap "Disable pass code using account credentials" in the
menu.
Enter your Barnes & Noble email address and password.
Tap "Submit" to disable the pass-code protection.
Enable New Pass Code
Tap the Home button and select "Settings" from the icon
menu. Tap "Device."
Tap "Enable Pass Code" from the menu that appears.
Enter a unique alphanumeric pass code, then confirm it in
the text-entry fields.
http://www.barnesandnoble.com/nook/support/
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