Just updated my recently purchased 2020 CX-5 Signature to the latest firmware.
It would have gone easier and more smoothly if somewhere in all the postings here, in all the instructions here and found on the Internet, there was a note saying "The Update Procedure Will NOT Work If Using a USB 3.x Flashdrive".
I tried three different flash drives on two different computers to make the update drive. The car recognized that a drive had been inserted, but after doing the "99" thing and having the update procedure look on the drive for the update file, it always said "No Update Found".
Scrounging through desk drawers I found and prepared a USB 2.0 drive. The update went flawlessly.
It's not like I didn't have an additional 40 minutes to waste, but it sure would have been nice to not do so.
I appreciate the long instructions posted here on how to do the update; they were very helpful. Thanks.