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1  Xbox 360 / XboxHacking - General / Re: Packet sniffing dashboard updates on: October 24, 2010, 06:05:38 PM
Quote from: InsaneNutter
Now on the leaked 12416 update which has working avatars the following .cab files have no file extentions, so I have removed them.

FFFE07DF00000001.cab renamed to FFFE07DF00000001
FFFE07DF00000002.cab renamed to FFFE07DF00000002
FFFE07DF00000006.cab renamed to FFFE07DF00000006
FFFE07DF00000008.cab renamed to FFFE07DF00000008
do not rename them.
for each file you have to extract its content without replacing. use winrar, if prompted, choose "rename all", so you get 70-100 files.
then merge them to one file. easily done in command prompt
Code:
copy /b $package+$package(1)+$package(2)+..+$package(97)+$package(98) MergedFile
then rename it to FFFE07DF00000001 and so on.

This is where I think we now have problems, it appears that in system.manifest the update process looks for a file called Xna_TitleLauncher.xex which we have not obtain by packet sniffing the update process.
system.manifest contains sha-1 hash of each file, so you can rebuild download link
http://download.xbox.com/content/fffe07d1/files/[SHA-1]/Xna_TitleLauncher.xex
Xna_TitleLauncher.xex would not downloaded because it was already on HDD. this file stayed unchanged in several updates.

We also have a file called fffe07d1/c49408b9f1639f2866e18e4dcdb31d0538628c08.xcp which i'm not sure if something needs to be done with that or not.
you can discard this one. it seems to be encrypted and packed cab file, after decrypting and extracting  it goes in cache directory of you 360, its name starts with "SU_".
this file contains sha-1 hash of main update file, having them we can rebuild the link to su89433E9D8FC4B3B8FC5BBDDD943DE71FBED207E6.bin.
so it seems to be just a downloader for su89433E9D8FC4B3B8FC5BBDDD943DE71FBED207E6.bin
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