I have a cart from r4isdhc.com I got the other year, I actually have 2 of them because it was a buy one get one free. It's the white dual core 2016 model cartridge. I've gotten it to run most DS games, but have an issue with some specific ones that won't launch. I don't know if it's an incompatibility issue or what but these games seem to just not load: Castlevania: Order of Ecclesia Super Mario 64 Zelda Phantom Hour Glass Zelda Spirit Tracks Soma Bringer The game loads but it will just be a white screen or the nintendo logo fading in upon boot before it freezes up. I'm sure there's more games that I'll probably have issues with too, but those are the ones I've tried and failed no matter what microsd I put in it. I know that my files aren't bad either because they run on my original R4 on my regular DS. I don't know if it makes a difference but I'm also using it on a 2DS and I am running YSMenu no problem on it with the newest firmware for the cart. I had the same issue with the older firmware though. Anyone having a similar problem or any experience with this R4 variant? I can't find any answers searching so I started a new thread.