I have a 2004 lS1 Holden manual 12225074 using 7.5 software and want to upgrade to 01290005 operating system where can I find the operating system to load into the PCM with 7.5.

Found the operating system under EFILive. V7.5 >calibrations>LS1B> Custom, however it will not open, says "File type not supported."