The most compliant method is to extract the ROM from a physical original Xbox. This typically requires a modded console and tools like mcpx-attack or specialized bios backup scripts External Sources:
) to enable low-level hardware simulation. Due to copyright, this file must be obtained from personal hardware and configured in the emulator settings, alongside a BIOS and hard disk image. For the full guide and required files, visit xemu.app/docs/required-files/ Required Files | xemu: Original Xbox Emulator Mcpx Boot Rom Image For Xemu