Yeah I always thought that was a pretty low-level lock. The offset is located at AC-AF right in the begining of the rom. If you patch a firered rom then to un lock a rom just go to that offset, and type BPRE. Also changing the map bank pointers or anything of the sort is still pretty low level. Just open the advance map ini file find the pointer, then reverse it. Then search for it in a hex editor(with a clean rom)(now you have the offset where it stores the pointer) then with the hack rom go to that offset and copy that new pointer, and create an ini file for advance map. :/ I have yet to see a lock, I haven't been able to break. What we need is an option in advance map where is adds a couple of random bytes at random free locations and dose not tell where dose locations are. If advance map opens a rom with that option selected, and saved. A message will come up saying that it is locked. But advance map isn't the only rom hacking tool, also again you can find map pointers and do everything advance map dose with a hex editor. So in conclusion, I don't see there ever being a good lock.