For Xemu [new] - Xbox Bios Files

Go back to the menu and click Hard Reset (or press Ctrl+R). If your BIOS file is valid and uncorrupted, you will be greeted by the iconic original green Xbox boot animation. Troubleshooting Common BIOS Errors Black Screen on Boot

(for testing only):

Kernel systems that load retail game executables ( .xbe files) Legal Considerations and Safety Xbox Bios Files For Xemu