How did you download the update; via kmarei's site or from the torrent? If it's a torrent run a check on it to make sure it's not corrupted. If it's a .rar file try extracting it again. Format the USB drive again fat32, copy the update to it again and test. All you should have in the root of your USB drive (drive must be 32gb or larger) is the folder pkgdb and a file called config.nfm. The update is 21.2GB in size.
335is Coupe Space Gray, ZPP, 609, 2TC, 688, 494 and 6FL.
Matte Black M310 19's | Michelin PSS 235/35F, 265/30R | COBB AccessPORT | Eibach Pro Street S | Painted reflectors | Glossy Black Kidney Grilles
–Modding ain't easy
FS: Front Lowering Spring Perches