Ok there has to be a obd2 scanner, or software that I can use to plug into my obd2 port and see the files that are on my ecm and also time stamps for when they were flashed or overwritten.

backstory is pretty much bought my truck in 2022 and haven’t done anything to it but some fluid changes as normal maintenance, well I have a blown head gasket so took it into shop. They send stuff over to warranty. Then come to find out trucks deleted. Well I truthfully haven’t done a single thing besides fluid changes on this thing and the dealer I bought it from is swearing up and down I deleted it and that when they sold it to me it was all in the truck and not deleted. Mind you this is a gmc Buick dealership of all places. Not some mom and pop car lot. I bought the truck because of the dealership and condition it was in but mostly trusting it’s from a certified gmc dealer. Should be solid.

now I am trying to get this info to prove to them I didn’t do a single thing to it and they blatantly lied on records that it was all there when sold.