I've been trying to troubleshoot why my friend's FBI isn't letting him install CIA files. He installed Rune Factory 4, Megaman Zero, the Maplestory game, and a few other GBA games yesterday, but today it's not letting him choose any options besides the copy, paste, delete commands.
The simple troubleshooting we've done includes replacing the CIAs with fresh from the ZIP copies, moving to a different folder, restarting his 3DS, and checking the version of his FBI. He's freshly installed homebrew as of yesterday with the ARM9 loader following the official guide for getting homebrew set up with Luma.