I did mine recently (2020-Lim).
Here's how it went down though.
In another thread someone was asking about adding USB ports to the vehicle using OEM USB part number.
That thread led me to look into firmware on my system.
Went in and did a "chck for updates" and it said "no updates available" (uses the DCM/OTA feature to check).
Hmmm, that had me looking, found the updates site, and both firmwares needed updating, many version numbers past mine was available for download.
I followed the directions and did both updates. Not sure I recognize any diffs though.
I guessing, the manual checking from the screen likely has a bug on their backend and it fails to properly recognize that there's actual updates available.