Downloading "BIOS packs" or "Firmware" from third-party sites is often unnecessary and can be a security risk, as these files may contain malware. Furthermore, distributing or downloading copyrighted BIOS files is generally considered copyright infringement. Since Xenia does not require them, it is best to avoid these downloads entirely.
To update the Xbox 360 BIOS:
At 99%, the laptop screen flickered. The 360’s fan spun up to a jet-engine whine. Then, silence. Xbox 360 Bios Download