Xbox 360 S 4GB Wont update

Ok guys. i havent contacted microsoft themselves yet but im to the point im about to (also yes i see all the errors in my typing and right now im just trying to get my point across and fix my xbox. thanks guys ) So Ive had my xbox slim for awhile but
i just recently decided to try and update cause i want to see if i cant get some dlcs for my favorite game. It wont update (as said in the subject) ive tried every solution this site and youtube guide channels have suggested. the only thing they are both telling
me is that i might need to get my console serviced by microsoft/xbox help. i have a financially sound home but we dont have spare money to just throw around (yes i know i said i was gonna try and get dlcs but that was gonna be over time). Im getting a 445E-0000-0080-0300-8007-000F
code.

This may mean that a storage device (memory unit or hard drive) was not found during the update

^^^^^^^

This is what xbox support is telling me. yet the update is 111 mb and i have a configured to my xbox 37.5 GIGABYTE USB in and i even used the transfer cord to hook up my old xbox 360 hard drive to see if that would help and let it be downloaded (i didnt
see it as a permanent solution but i really want to be able to enjoy my xbox to its fullest potential. ive downloaded the update to a different usb and tried to put it on that way (still told me that it didnt have space to put the 111 MB update on my xbox
even with the 37.5 GB USB hooked up.) I did the cd/dvd route. another failure. ive even deleted some unessitial or old content from games i dont really play as much anymore. Im at a wits end here and i already feel crazy most days guys. I could use some gamer
community support here. i understand i may not actually find any solutions and will probably have to get it serviced anyways. But i have to try for my family.

:)