Hi,
You need a USB drive formatted to FAT32. In cmd you write: format >driveletter<: /fs:fat32
Then you need to create a folder on the USB drive called
SMEG_IV2_UPG If you don't car will say "no media on usb"
After that copy all the files you downloaded from here:
[Please Register or Login to download file] ... o1CemllImE into that folder.
Start your car and insert the USB, it will start the guide and show you current version and new version.
I updated my Citroen C4 2016 from CD version 30268 to 31210. And System version went from 6.1.dr.8 to 6.4.ar.10