Safely eject the USB and plug it into your JTAG/RGH console.
While many JTAG/RGH dashboards automatically bypass DRM, some raw DLC files may still arrive locked to a specific console ID. Generations Sonic -Jtag RGH DLC-
Horizon is a PC application that simplifies DLC installation for beginners. Safely eject the USB and plug it into your JTAG/RGH console
(per official Xbox 360 release):