[zyNoT]

You can't make an overlay from a screen file. At least, not directly. You have to have those set on a temp calibration file and then export to create an overlay from those set parameters. You also need to make a filter file so that you only include parameters that you want in the overlay, otherwise it will export every single parameter and it's value out of a calibration which will destroy any other engine you flash it to.

I don't even use Calterm to create overlays. I use Cummins MFG Tools Suite w/MATLAB and Simulink. They're not publicly found and not many have them.