I'm sure this has been asked before but after digging through around 50 pages of forum posts I couldn't find an answer that solved my problem. I have rxTools 3.0 running on a 4.2 sysNAND 3DSXL with emuNAND 9.9.0 installed. I followed this tutorial (https://gbatemp.net/threads/tutorial-installing-rxtools-custom-firmware-3ds-and-2ds.390867) and while 3DS games work fine I am having trouble getting GBA games to load. I replaced the H&S app in both sysNAND and emuNAND and tried installing a .cia for Metroid Fusion using FBI injector, selecting NAND as the destination in both cases. In emuNAND I can unpack the cia package, but I get an error upon loading and have to power off the system. In sysNAND, the cia package doesn't show up on the home screen unless I boot rxTools and go Advanced -> Dev Mode. Then the cia package appears and I can unpack the game, but loading it in sysNAND still gives an error. Booting rxTools to sysNAND and loading the game doesn't work either. Note, my NANDs are unlinked and I haven't used the AGB_FIRM patch since the tutorial specifically says "The patched AGB_FIRM is no longer needed" in the section regarding GBA games. I'm at a loss for what I am missing. Could someone who has successfully gotten GBA games to load suggest something I could try? Thanks.