Your post is not clear.
Make sure you go to 2.2.xx first before moving to the last 3.0 avaiable.
Follow this post as a guide → 2016 Mustang Sync3 1.0 updated to 3.0 and no Apple Carplay! - #10 by SaNdMaN
Also, you will need to upgrade your usb hub since the vehicle is from 2016 → Media Hub, CarPlay Compatible - 2015-2020 Ford/Lincoln - SYNC 3