has anyone had any luck, tuning TCM only, I have 2019 Ram 3500 6.4 8spd and trying to get firmer shifts, according to Brian@HPT you should be able to read, edit and write TCM only even if ECM is NOT UNLOCKED. I have Smart cable installed, latest stable and beta versions. I am able to edit and read TCM but not ECM, not sure why ECM is unlocked but I get x35. When reading stock files I skip reading ECM and read TCM only after writing TCM only I get U402 and U01110 DTC,s