Assuming you have the shunt and not the Hall-effect device . . .
An excerpt from the .SFG file:
Code:
sensor={
id=AMMETER SHUNT (100412-000) NEG POLARITY
function=AMPS
pins=C37_P24/25
I would try changing NEG to POS POLARITY.
But I wouldn't be surprised if Dynon provides a UI feature to do that for you somewhere in the setup menus.
Also, IIRC copies of your .SFG and .DFG files are saved on the USB thumb drive when you do a firmware update. Maybe you still have them.