I got this cart a week ago and it says its revision C. The site where I bought it told me that it was an old revision and it is preupdated to work on the latest DSi firmware. I didn't mess it up around so much so I could return it if it was faulty which it's not. I tried updating the firmware of the cart using the official patches downloadable at r4ids.cn but I get a fail. When I selected the Help option from the start menu of the wood r4 menu. It says this. It's weird because even though I got a fail, it says that it works on 3DS 6.20-12. I didn't even cut the signal line on the cart which I think was in between C1 and R9.