Who told you that? The factory code on that card is hard coded to the body control module. You can add a personal code on top of the factory code, but that factory code can't be changed or deactivated without replacing the body control module.Once you change the code, the code from the factory is not longer valid and can't not be used again.
On that same note, the 5 digit factory code will be on a sticker, somewhere on that BCM (possibly on the back, I haven't had to dig for one for a Maverick yet).
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