While Xemu can technically run with several different BIOS dumps, Complex 4627 has emerged as a community favorite for several key reasons:

The is a modified (hacked) version of the original Xbox retail BIOS that is highly recommended for use with the xemu emulator . Because xemu does not currently support certain Digital Rights Management (DRM) functions found in official retail BIOS files, a modified version like Complex 4627 is necessary to successfully boot games and homebrew software. Essential Files for Setup

If successful, you will see the iconic original Xbox "FLUBBER" animation (the green, wavy boot screen) followed by the stock dashboard.