Hey guys I've searched and have no real answer to any of my questions regarding the x2. I bought a used one for 100 bucks. I don't know if it's a 9400 or 9415. I had to update the firmware in order get it to work on the computer. I have no idea what it means when it says % written and can't find an answer. I'm assuming it's a 9415 as the sticker on the back says pmtdiesel.com it has three options that come up like mileage and I forgot the other 2. But I have no idea if these are canned tunes. Is there a way to check this stuff and see what the strategy is? It's possible that I'm overlooking something.