He relaunched Xemu. This time, the familiar green "X" boot animation appeared, followed by the Xbox dashboard. Halo loaded without another hitch.
The Missing BIOS
He changed the line to:
Leo opened xemu.toml (the config file) and found the line:
Leo knew "flash file" meant the Xbox’s flash ROM — a tiny chip on the real console holding the BIOS boot settings and certificate data. Xemu needed a copy of that flash image to emulate the startup process. Without it, the virtual Xbox couldn’t even power on.