How to add Roms:
1. Unpack GBAdvance_ (PS2) .pkg using FAKE_PKG_Generator ;
2. Open Image / disc01.iso using CDGenPS2 v3 ;
3. Place all your roms files in the ROMS folder ;
4. Generate a new iso named disc01.iso with your roms files within ;
5. Repack the Fpkg with the new generated disc01.iso (use same password : 00000000000000000000000000000000).
Additional details in the psx-place news coverage:
http://www.psx-place.com/threads/play-regba-ps2-gameboy-advance-emulator-on-the-ps4.22403/#post-156899 or
http://www.logic-sunrise.com/news-1041822-ps4-maj-le-portage-de-lemulateur-tempgba-disponible.html

PS4 ReGBA (PS2) Gameboy Advance Emulator v1.0
A Gameboy Advance Emulator for the PS2, Packaged for exploited PS4 Console's as PS2 Classic's