Possible to clear TheftLock before removal?

I have a BOSE head unit from a 99 going into a 97. Ive seen this done before, and im looking to dodge the "$100 whether it works or not" dealer charge. Can i clear the theft lock from the 99 before i remove the radio? (have keys and power).

Otherwise, i do know someone with a Tech II that is not a dealer. He thinks he cant do it, but can he? It should just be somewhere in body options -> clear VIN once the stereo is installed in the 97???

Thanks!