I bought a Dell XPS with Ubuntu (XPS 13 9360) last year and I found a problem with my thunderbolt to HDMI adapter. I was unable to upgrade the flash from Linux, I was not sure which of the payloads available on DELL repository on Github to use, I was worried to brick my adapter. I was going to find a way to boot my laptop using Windows (I was even about to buy a license) while I checked back the DELL repository and I found out that it was possible to use fwupdate to flash the DA200. I succeeded to update both the BIOS and the Thunderbolt NVM in one pass.
Thanks DELL, now I can go to speak at free software conferences with a laptop running free software.