When searching for "Lemuroid BIOS files free," you will find dozens of websites offering "BIOS packs." While these files are technically distributed for free on the internet, you should exercise caution:
Close Lemuroid completely (swipe it away from recent apps). Reopen it. Launch a PS1 game. If the Sony logo appears smoothly and the game boots, your BIOS is working. lemuroid bios files free