One gotcha, which catches a few people out. You have to select "Expert" mode in Menu -> Setup -> System Customise -> Setup mode = Expert
Any other setting and you lose some of the menu settings - and not only in the Network section. From memory, some of AV settings go missing and probably a few more elsewhere.
Possibly having a setting backup with the Setup mode = simple or intermedite results in a the menus items being hidden after a image download followed by a restore of settings. You first need a setting backup with the mode set to Expert.