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There's likely already the correct firmware/OS in the transmission TCM, but you do need to use HPT to write your VIN#.
In the event that you do have a mismatch in levels between the ECM & TCM, I think only GM can flash the proper segments to get them to the same version.
If you have a "cool" dealer, have them reflash everything with the newest version. Then while still there, use HPT to just flash the ECM.
After you get home, do a full read of both the ECM & TCM, and then use that image from then on.
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Jack Bilger
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