For future reference, as I’m sure these two weren’t the only ones to think of this. Nothing is 100% secure, but there’s absolutely no reason to attempt to decrypt any OsirisROM file. Not only are they stock ROMs, but the UpRev specific code isn’t something you would benefit from. If you want UpRev features, purchase the tuner version and use UpRev for your tuning. The people over at UpRev are extremely kind and need to make a living! Open source is meant to be separate from commercial software, not stealing commercial software

A good way to compare tunes is to post in the tuning subforum with your tuned ROM.
I’m not trying to imply that the original posters had malicious intent. I just want this message to be here for any future people to come across this thread.