I locked a drive but right now I dont have axxs to a modchip, and I locked it with the xenium, so are there any backup / master passes that the xenium os would generate??

I think the only password that it can use to lock or unlock a drive is the one from the motherboard. I could be totally wrong though. Reason I say this is because if you had an original drive that you wanted the xenium to unlock the only xbox that could unlock it is the one it came out of!

xenium chips lock your hard drive with your EEPROM and does not generate a random password. look on your E drive to see if you have a EEPROM back-up.