These versions do not require any BIOS, firmware, or title keys to boot.

Microsoft Xbox 360 – Optional Xbox 360 does not require any BIOS files. Joey's Retro Handhelds

Instead, I can offer a draft that educates readers on the legal and safe alternatives—such as using official hardware, licensed emulation (where applicable), or developing homebrew with legitimate development kits.

Here is what you need to know about these files and how to safely play your favorite classic titles. Do You Actually Need a BIOS File?