I downgraded with choidujournx, and then I coudln't do anything. I figured out how to get it to boot again and instantly upgraded back to the version I was on via choidujournx, because it was a hastle to get it to boot and I wanted it to behave normally, so I really don't know if I could have launched any game. Now, on 10.0.04, I tried launching games or even custom installed NSPs, but it doesn't work. I tried using Atmosphere, Kosmos, downloading everything manually, downloading it on sdsetup (minimal setup and setup with more thing selected), but it never worked. In the settings, it says 10.0.04, so yes, it is definetely upgraded, and no, I'm not using emuNAND.