Just to make sure, you did try all the solutions in the Luma3DS wiki, right?Can anyone tell me the causes of a black screen when launching GBA games?
Old 3DS using recent version of the guide, with no-SD-needed upgrade of a9lh, no AGB or TWL modifications.
Link: https://github.com/AuroraWright/Luma3DS/wiki/FAQ-and-Troubleshooting
I guess, once we can clear those out. We can move to other solutions.