I'm currently using Luma 6.6+A9LH on 3DS with 11.2. Recently, I tried to play "New Super Mario Bros." on my 3DS using a retail cartridge I own. Now I'm aware that I can't play any DS games on my console. The only thing I get is an immediate black screen showing "An error has occured. Press and hold down power button..." and I honestly don't know why, but I thought of some things I did some months ago that may be useful to mention. A few months ago, before updating to Luma, I wanted to give new life to a flashcard I used to play with on a NDSi, so I installed a file named "Flash Card Time Warp.cia". It didn't work though, so I forgot about it. I didn't try playing with my original cartridges after that. As of now, the only thing I've tried is reinstalling the clean versions of AGB and TWL system files (without success, of course). If I could get any more hints about what's happening or what I can try, it'd be very much appreciated.