Even though it isn't strictly required for gameplay, users often look for BIOS or firmware files to enhance the "authentic" feel of the console or to fix specific issues:
To use real fonts and system files, you must place them in a folder named flash0 within your PSP directory. ppsspp bios
Many sites offering "PPSSPP BIOS downloads" are hotspots for malware or unauthorized distribution of copyrighted code. Even though it isn't strictly required for gameplay,
A tiny fraction of games may behave more reliably when using original system modules rather than PPSSPP's simulated versions. How to Install "BIOS" (Firmware) Files in PPSSPP How to Install "BIOS" (Firmware) Files in PPSSPP
Within PPSSPP, go to Settings > System . Look for options like "Use fonts from PSP" to ensure the emulator prioritizes your files over the simulated ones. Legal and Safety Warning
If you have dumped the files from your own physical PSP, here is how you integrate them: Windows: Documents/PPSSPP/PSP/SYSTEM Android: PSP/SYSTEM on your internal storage.
BIOS and Firmware files are copyrighted material owned by Sony Interactive Entertainment.