Need some os help or guidance on segment swap

I have been running a tune from an 01 Tahoe with DBW and a 4l80e segment for a while now. PCM bricked and I bought a reman PCM that was from a 2002 Escalade with OS 12209203. I am trying to find a compatible OS to do a segment swap to 4l80e. I was running an 01 OS prior and there were lots of options for a segment swap. I cant for the life of me find a file with 4l80e for this OS. If there isn't an option available for this would it be possible to put a different OS on this to have the capability to run a 4l80e. I am assuming that I cant go backwards and flash my 01 OS on a 02? Thanks in advance for any help.

Make sure you pick the base tune that works properly with your wiring harness. 01 -> 02 should be ok, as long as the wiring is the same. I'd try to Write Entire your old 01 tune to the new PCM, you might have to spend 2 or 4 credits to license it if you dont have that year/make/model unlocked.

If you want to stick with an 02 OS, find a stock file with the 12212156 base OS. Plenty of trans options available. The one you have now is one of, if not the, oldest 02 OS'.

Im in the same predicament.. Did you ever find a 4l80e os to work with the escalade os?? Any Help would be appreciated.

What OS are you looking for? Post your stock file up.