I've got in my Fenix 6 software version 13.1 and the latest version is 15.2. Auto update is on. What else should I do in order to get updates ota?
Connect the watch with an USB cable to a computer with Garmin Express, and click "Check updates" there. Also check in the About menu of you watch, wether it is not an APAC version. APAC models of Garmin watches usually get firmware updates later than the regular models, though I am not sure whether it is the case at Fenix 6 too. You better ask on the F6 forum - users there will know better.