Fritz!Box FW 8.24 (Labor) / FRITZ!Box Tools not working anymore

Integration name

FRITZ!Box Tools

Link to integration documentation on our website

Problem

New Firmware for Fritzbox (e.g. 7590 and 75 AX) is coming: 8.24
At the moment, there is a labor version for testing:

Maybe something has changed in this new version, maybe its only a labor bug, I don´t know.
But I think, there is a chance to look on it.

Error Message

FRITZ!Box 7590
Einrichtungsfehler, wird erneut versucht: Unable to retrieve resource xxxx://192.168.178.1:49000/x_speedtestSCPD.xml from the device.

(xxxx.// because no more than 2 links are allowed here …)

Why was it reported here even though the firmware is a lab version

This problem solving is important, because maybe we all get a big problem, when this integration is not working anymore, when FW 8.24 is going to release …

Mit der Version FRITZ.Box_7590-08.24-127533-Inhaus geht alles wieder.

Darf ich fragen wie man an diese Inhaus Firmware kommt?
Ich habe nämlich das gleiche Problem mit der aktuellen Beta! 7590 AX