Fenix 6 Pro refuses to install ANT/BLE/BT update

It downloads the file allright, I ask the watch to start the update, it restarts and says that the bluetooth software has been updated, yet the version remains stuck at 4.30

I retried a couple of times, also through Garmin Express, but to no avail. I even tried to update it to the 8.73 beta update including all the sensor/GPS/BL updates, which ALL update EXCEPT the ANT/BLE-BT part .... still stuck at 4.30! What can I try else in order to get this part to update as well? Many thanks!

(I particularely want to have the latest bluetooth software as I hope this will resolve (some of) the poor connectivity to my iPhone)