Thanks for the guide! Much appreciated. I have adb/fastboot installed and flashtool set to download the firmwares.

In the "Import DRM keys" part, I think there is missing av adb push or did you use a physical micro sd card to have the TA dump(TAbackup.img) available on the device?

At this point my Sailfish X is factory resett, updated to the latest version with no additional software installed. Still, one cannot choose a operator manualy. I'm not shure whats going on, but hopefully reflashing will solve this. I truly hope Jolla have managed to get a reliable telephony stack after all these years.