I'm sorry but I don't know where else to post this: I could play VC GBA games before. Followed the AGB_FIRM patch guide before. I installed it and had at the time aureinand 3.4.17 and after updating I'm no longer able to play gba vc games on my o3ds. What I did to "fix" this is to change the payload to the one that was before luma 3ds, in the aurei folder. By doing so, I'm able to play GBA VC games, but whenever I install again the Luma 3DS 5.4, it doesn't work. I've tried almost everything, even redownloading a new 0004013800000202.cia (v3665) and reinstalling it on my NAND, but I'm still unable to play, even when loading from Luma3DS.
The thing is that I installed A9LH to my friend's O3DS, and he didn't have the patch applied to 0004013800000202. cia, but he can play GBA VC games and I can't. Please help me I'm a noob and don't know what else to do??