Unlinking Keypad?

Usually if you just pull a battery out of the keypad and reinstall it it will find the new base station, i can yake my keypad and take it to your house and pull a battery reinstall and it will connect to your system or it should. But try doing it right next to the base station and see what that does

You don't need to unlink it if the old base is non-functional (well, actually, you can't since that link is IN the base).  If the old base is functional, you can delete the keypad using the online dashboard (if it is monitored on the interactive plan) or the setup wizard in the USB in the master remote (SS2) or via the keypad (SS3).

neither methods work