I did not check. Took the OP's word for it. In many cases, Garmin makes a new update available incrementally. Which is to say that it takes a while for the update to become available to ALL devices in the field. So the OP may have it but it may not be available to you yet.
That said, the most recent update listed on gpsrchive is 9.20:
I don't know of any official Garmin source for up to date firmware release history. There are "Web Updater" pages, but they are chronically out of date.
Edited to add: Click Firmware in the left sidebar on the gpsrchive page linked above.
