Maxifiola,
I have been going through the same exact situation. EXACTLY the same id #'s and problems.
Here's what i have come up with after a lot of messing around with the files involved.
The TU#6 for Halo 4 (4d530919) is not the latest update at all. when you force it to be used it will read as Version 1.04.01 on Halo's main menu.
What I need is version 1.05 . So I'll be seeking out friends that still have fat xboxes so that i can update my retail Halo 4 and gleen the update from that. If it works for me , I'll upload it to jqe.
I am not sure about the naming in jqe because the TU#6 that they have does not load unless you change the "5" to a "0" in the file name. Maybe thats the name of the version 1.05 TU?
Update: So i drove to a friends to find the file on thier drive and when i fired up thier xbox, it required a tu update.
Its a new title update just released today, it has to be because i was playing last night without a single prompt to update.
works great and i have to look up how to submit it to jqe next. hopefully someone can contribute with the missing update file.
this is what i think the Jqe catalogue should have for Halo $ TU's Media ID 1c9d20bc Title ID 4d530919
TU# Version #
5 1.04
6 1.04.01 <--- this file is miss named and should be corrected (at jqe)
7 1.05 <--- not in the jqe cataloge (as far as i could tell)
8 1.05.01 * current as of 11/11/2013