i unlocked my xbox hdd with hdunlock so i could clone it and put a bigger hdd in my soft modded box, then i cloned it in xboxhdm and rebooted now its locked i didnt lock it, and the key from backup does not work.

any suggestions?

I have another softmodded box here, and like 3 original xbox hdds. if any of them can help

HDUNLOCK does not disable the password, so when you rebooted it did lock, and the password you orginally used to unlock it will work.