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xemu.exe -bootrom "C:\Xemu\roms\mcpx_boot_rom.bin" -bios "C:\Xemu\roms\Complex_4627.bin"

Because these files are copyrighted code owned by Microsoft, they are not bundled with the emulator. Xbox Emulator Xemu Setup Guide

To cross that bridge, you need three "keys" to the castle: a Flash ROM (BIOS), a Hard Disk Image, and the elusive MCPX Boot ROM image

| Feature | MCPX Boot ROM | Xbox BIOS (Kernel) | | :--- | :--- | :--- | | | Burned into the NVIDIA MCPX Chip. | Stored in a TSOP flash chip on the motherboard. | | Size | Very small (Bytes/KB). | Larger (256KB or 1MB). | | Role | The "Ignition Key." Decrypts and loads the BIOS. | The "Engine." The Operating System (Kernel) of the Xbox. | | XEMU Need | Required for accurate boot sequencing. | Mandatory for the emulator to run games. |