WARNING : Do Not Enter Service Mode In 3.56
DO NOT ENTER SERVICE MODE IN 3.56 OR YOU WILL BE STUCK IN IT AND CAN'T GET OUT !
DON'T TRY THIS ON 3.56 !!
APPARENTLY WE CAN'T RESIGN THE LV2DIAG.SELF AND WE WON'T BE ABLE TO SO YOU WILL BE STUCK IN SERVICE MODE AND CAN'T GET OUT.
NOTE : Service mode is totally different from recovery mode.
Service mode requires a usb dongle to be inserted on startup and goes into xmb with a box saying service mode.
Recovery mode is a menu that comes up when you hold the power button