Before downloading an Xbox 360 BIOS, please note:
: Files for the first-generation Xbox (like the Cromwell BIOS or retail dumps) which are used for emulators like xemu . Xbox 360 Bios Download
The Xbox 360 does not have a “BIOS” in the way a PC does. It uses a combination of a boot ROM , a kernel (stored in NAND flash), and cryptographic keys. You can’t “download a BIOS” like you would for an old PC emulator. Before downloading an Xbox 360 BIOS, please note:
Downloading BIOS files or "system firmware" from third-party sites carries significant risks: Before downloading an Xbox 360 BIOS