why did i not recieve a system update when i put my usb in my rgh to update avatars

i have updated to the latest dash but when i try to do the avatar update nothing comes up also the file isn't corrupted i checked on xex menu
could it be because i deleted the flash dump + upd flash dump or something like thst
i deleted them because i think they were corrupt as it bricked my rgh but i got a guy to fix my rgh and install the new dash for me so thats why i deleted the file because if its on your xbox i figuered they dont need to be in the usb anymore.

please if you know the answer, give it to me