After the announcement of the first nand dump and software to change the hard drive of the console.
The method of activating Debug mode is now known!
For the average user, this feature does you no good. But for devs, this can open a lot of doors.
For those wishing to see the debug mode by themselves simply go to System and press
(LB - RB - LT - RT) and the parameter "menu item Developer "will appear.
Here are some images of the debug menu from French source, logic sunrise.
Credits to XPGOByto for the original links