If you are actually looking for BIOS files for the (the predecessor to the 360) for use in emulators like xemu , the common files are:
When enthusiasts discuss modifying or rewriting the Xbox 360 "BIOS," they are usually referring to via hardware exploits like RGH (Reset Glitch Hack) or the legacy JTAG exploit. bios xbox 360
Steps:
A hardware programmer (like a JR-Programmer or Matrix Flasher) is soldered to the motherboard to extract the raw system image. If you are actually looking for BIOS files
Xenia is an experimental emulator that utilizes a high-level emulation (HLE) approach. The developers of Xenia have successfully reverse-engineered and re-implemented the Xbox 360's kernel functions and system software in code. bios xbox 360
Loads updates and patches the base kernel if a newer system update is present. The Hypervisor