Morning all!
I apologize if I have chosen the wrong thread category.

Have acquired a couple of ECU/PCM's to experiment/learn with on the bench. (price was right: free) Oddly enough both are out of 2000 GMT800's and show to have the 9381344 operating system. The OS searches in the forums has found very little .xdf support and suggestions are usually made to switch to a more supported OS. GM TIS shows the 9381344 was replaced with the 12205612 OS at some point.


Having searched with multiple criteria, have yet to find out a explanation how to do such a OS swap. Probably using the wrong search criteria knowing my countyline brain.

I have a operational bench harness, as well as TunerPro, TunerProRT, and PCMHammer on the laptop. Used LSDroid to do the initial read with a OBDLink MX+

One of these may eventually end up in a 5.3 swap into a early '80's square body.

Thanks all, have learned allot on the forum and have a long way to go.