You Will Need

-Cabooses Resigner[Release] MW3 mpdata resigner
-Horizon or Similar Program
-USB Drive or Transfer Cable
-Hex Editor

So you are going to need to get your MP DATA file off of your HDD or USB drive
(Its in your MW3 Game Saves Folder)
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Now Extract The mpdata file to some where.

Next You will need to open the mpdata file you just extracted and go to file contents and extract the mpdata file located inside.
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Make sure you know which ones are which

Now open the mpdata file you just extracted in your hex editor
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If you are using HxD press CTL+G and tell it to find offset CB0
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If you have not prestiged your line should read like this... 00 00 00 00 00 00 00 00 98 07 01 00 5C 00 00 00 18 A5 1A 00 F4 01 00 00 64 00 00 00 00 00 00 00[spoil]



Now save the file.

Drop the file into cabooses save resigner (The program Will Close Instantly)

Now go back to modio or horizon and import the mpdata file back into your package,
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Overwrite it when it asks, now rehash and resign the package and save the file back to the disk.

*Now your Done!*