I'm very new to this so I'm sorry if this is a dumb question, but I'm trying to help my niece that just turned 16 and bought a 2006 Silverado that was originally a v6 but the previous owner blew it up so he swapped a 5.3 LM7 and ecu out of a 2003 silverado. It's runing pretty good ish. However, the vin on the ECU doesn't match the vehicle
I tried the Vin change wizard but got Invalid VIN/OS Pair
The OS on the current 2003 ecu is 12579405 and won't accept the trucks 2006 vin. I found a stock map for a 2006 Silverado that had an LM7 in the Repository and I tried the Change vin wizard and it would accept the new vin. The OS on this tune file is 12587811
So I just wanted to ask before I try something stupid and brick this ecu, Can I take the tune file with OS 12587811 from the repository that will accept the correct truck vin (use the compare file to keep everything the same) and load it into the 2003 ECU that currently has OS 12579405 or is this a dumb idea?
Follow up question if the answer is No, how would I get the ecu and truck vin to match? Is there a different way I'm not seeing or will I have to just find a new ecu that already has OS 12587811 ?