Hello community!

I have an AX55 Pro V1 (EU) that regularly loses its internet connection. When this happens, it can no longer be accessed via the web interface to reset it.
Also interesting is firmware version 1.4.3 Build 20250813 rel.63911(4555), which cannot be found anywhere, not even on the support page. It is not possible to reflash the firmware.

In addition, the web interface is sluggish.
Has anyone else in the forum observed this? 

My setup looks like this:

FRITZBox 7530AX (modem) --> AX55 Pro (router) --> PA8010P --> 3x WPA8631P in the mesh network

Is there a way to upgrade (or reinstall) the firmware or downgrade to a stable version?

Many thanks,

Gregor