I just used my elm 327 v1.4 to program / change the vin . :afro:
You need to unlock your pcm
Set the elm for long messages
Enter mode 28 (optional)
Set the header as 6C10F0
Then 3B01(NEW VIN) six bytes in ascii
All up 18 bytes the first one is 0x00
Switch ign off for 15 sec
You can program one line only as well.
If we can work out the vats relink flag you will be able to swap pcms from one vehicle to enougher.