The "un-hackable" revision that lacks a TSOP (Thin Small Outline Package) flash chip, instead using a "Cyclops" ROM chip that requires a modchip or advanced methods like to override. Modding: TSOP vs. Modchips
Legal and Ethical Considerations
: If you used the Rocky5 softmod tool, navigate to NK Patcher > Advanced Features > Backup Xbox BIOS . original xbox bios