GM SPS/DPS Files — VIN, PIN, Seed-Key and Session Support 2.1.1

Use this thread for GM SPS file discovery, VIN or PIN field interpretation, utility and calibration listings, GMLAN seed-key input and saved-session questions. Include the module context, source file type, exact size and redacted error; never post live PIN, seed-key or customer VIN data.

The complete workflow, limitations and verified package are here: