V8 will unlock the ecm with ALT Key 2, but stops when it sees corrupt SN trying to write. It reads fine. I just need to figure out what the KEY is,

I've got an E38 ECM trying to unlock. Someone put 08 OS on a 2010 service number. ECM responds, I was even able to change the VIN in EFI Live. EFI Live will unlock and READ it fine, using ALT KEY 2...