Problems updating to sw 18.23

Hi together,

i have problems updating from 18.22 to the latest version 18.23. 

Garmin Express telling me I'm up-to-date with the installed 18.22 (using USB); however Garmin Connect sends the the Update 18.23 via Bluetooth to watch. 

Also the Update search on the watch directly (starting manual under Menu > System > Software Update > Check For Updates) provides me with the Update file on the watch via Wifi.

The Problem is when I try to install the update (watch tells me it would take 2 Minutes) the watch always does the same;

1. check the update 

2. reboot

3. watch starts normally with sw 18.22

Is there any way to install the update properly?

Thx for your reply