Firmware 16.60 on Fénix 6

This afternoon, I allowed Express to update my Fénix 6 firmware from 15.20 to 16.60.

This update is a disaster : after finishing, no restart of the watch, no installation after manual restart. Firmware version is still 15.20 according the info parameter of the watch and according to Garmin Connect. But... Express says 16.60.

I don't know if the problem comes from the update itself or from Express (V7.5.0.0), but it's a serious worry.

I precise that I tried to update on an other PC, I hard resetted the watch, and finally re-installed 15.20 firmware with the Garmin WebUpdater, but nothing changed.

I suggest Garmin to stop deploying this update until the problem is solved.

Thanks.