HELP! cant change the OS`s over how do I do it?

[LuthurUbU]

I have OS 12604138 and want to change some tune files to OS 12616698 . their used to be a video presentation on how to do it but that site took it down I guess. I have tried the way that I know how thru script but it dosent seem to work! any help guys would be great and I am running EFI V7.5.5 build 88 and once again thanks in advance guys

[Brian1]

You need a stock tune of both OSes you mention. Then load the stock tune of the 4138 and then load a comparison tune you want. Create a script from that. Note keep everything in Imperial format. Then exit that and open your stock 6698 tune and run the script onto it. Save it and ready to upload to ECM.

Brian

[LuthurUbU]

I think I forget to put it in imperial thanks again for the info

[LuthurUbU]

yeah I tried that and still nothing. what else could I be missing?

[Brian1]

Are both those tune versions from the same generation Duramax engine. I am unfamiliar with OS versions beyound LLM side.

Brian