I have a 2001 Impala 3800 that I pulled the info out of and when installing the info back on some how the pcm wiped out. I had another pcm from another car that I installed and had to use 2 more credits to perform a few things to. Is there any way I can put the original vin number back in this pcm? I tried the change vin option and it would not let me do it. I searched and couldn't find anything labeled how to do this. Can I just install the original tune back in the pcm since the vins are different?

thanks for any help!!