Latest firmware 1.22

I have trouble installing the latest firmware update 1.22 for my XDJ 1000MK2. I have extracted the file, copied in a Fat formatted USB on the root, as usual. When loaded into CDJ after "insert USB storage device into top USB port" appears, I insert the USB, seems to be recognized because the USB port light stops blinking and just aqua color, but nothing happens. The update does not begin, as it should. Im currently running version 1.20 and never heard of 1.21 version.

Please help :)