From what I can determine, the firmware you linked to from Inverto with version number
V1.25.0.157
is the same as the Telestar firmware
V1.24.0.156
The release notes are exact duplicates of each other it seems.
Have you had both those firmwares installed?
Is there a difference?
The link to the Telestar V1.24 firmware
https://telestar.de/custom/downloads/asset_dab80b09ff7ba70bc9d274abc0edb292_soft_Digibit_R1_005.zip
I would like to know if there is a good reason to change the firmware before doing anything.
Thanks.