Ford 6.0 Diesel Rollback PCM

[MartinL]

Hi everyone. I have a working VCM II and IDS v86. I been trying to is roll back my PCM calibration from VXCF9 to VXCF4 base. I have the Tear Tag code, even the PHF calibration files from the Motorcraft Service site for PCM, TCM, and FICM. The issue I keep running into is, the software is persistent about updating to the latest calibration, even when there's no Net connection with key in the off position.

I've read to simply rename the files, which I've tried, and IDS states it cant be found or is corrupt. There have been a few people accomplish this but few talk about it on forums. Anybody have any leads or tips to try? Thanks!
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