I had a bit of trouble at first but I followed the poster ratmonkey's advice which I have copied here further down so if it works thank him. Please bear in mind I have not done the most recent update as I have been busy playing mass effect so these instructions cover up to viper 2.2
View the files on your USB on a pc you should see the content folder then go
Content/0000000000000000/4B4E0861/00000001/
In this path you need the following:
DpFileList.bin(From online folder in v2.2. Choose the version for your region.)
dt80_100E_x36(Vipers datapack 1)
dt80_100E_x36(Vipers datapack 2, both datapacks with same name)
Viper 1(v1.0)
Viper 2(v1.2)
Viper 3(v2.0)
Viper 4 (v2.2)
Viper online(From online folder in v2.2)
In the other folder in the content, click the one that starts E0001 and keeping going (I think only 2 other folders) until you get to the last one which is folder 00000001 then stick the edit file which in my case is EDIT00000000(v2.2) as I have only gone up to 2.2 in this folder.
Hope this helps, make sure you extract all the files otherwise it won't work and if I remember right 1.2 replaced 1.1.
Good luck