Some developers experimenting with low-level emulation might extract the CB, CD, and Hypervisor from a NAND dump to create a custom emulation environment. But for 99% of users, you do not need a BIOS for Xenia.
If you see a website offering a xbox360_bios.bin file for download, it is either: bios xbox 360
Technically, the Xbox 360 does not have a "BIOS" in the same way a PC does; instead, it uses a multi-stage bootloader process stored on an internal flash chip. : This typically means the console does not
: This typically means the console does not detect an AV cable . Check your connections before assuming a software/BIOS failure. The console’s region, DVD drive key, and console
Unlike a PC, the Xbox 360 has and no user-editable BIOS settings. The console’s region, DVD drive key, and console serial are fused or stored in encrypted blocks inside this flash.