Had this unit since around 2008, but always loaded via V2 with laptop (win8) Have done all the updates and firmware every year or so since I have to go back to a stock tune for emissions testing

So finally last year I converted all the tunes to CTZ and loaded a few onto the V2 which I finally used stand alone. Worked for just the stock and DSP5 tune (running now) but nothing else will load now except those 2??????

Not real happy with my DSP5 tune (mileage and smoke) but it works. I liked another tune I modified but it will not load at all now (all tunes show on the V2) They act like they load, but do not. Get a "checksum" alert sometimes.

When trying to load even through the V2 from the laptop, and just get "script error" alerts. Did some searches but still noting makes sense. Main PC runs W10, laptop is W8 and have updated both.

I would like to tune via the V2 stand alone and get some new tunes, but the above issues had me stumped.