You won’t find an official, all-in-one BIOS pack on RetroArch’s website. Distributing BIOS files without permission is illegal in most countries. Many “packs” online contain malware or incorrect, mismatched files that cause crashes.
The Ultimate Guide to the RetroArch BIOS Pack: Everything You Need to Know retroarch bios pack
Note: There are various tutorials on YouTube and sites like GBATemp that explain the dumping process for specific hardware. You won’t find an official, all-in-one BIOS pack
If you want your RetroArch experience to be as plug-and-play as possible, a BIOS pack is a necessary evil. Trying to troubleshoot why a specific PlayStation game won't load is often solved instantly by dropping the correct BIOS file into the system folder. The Ultimate Guide to the RetroArch BIOS Pack:
: Files such as gba_bios.bin for the Game Boy Advance or bios7.bin / bios9.bin for Nintendo DS. Implementation and Setup