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Lineage-23.2-20260309-NIGHTLY-pro1x with February 1st security patch installed smoothly via OTA. MindTheGapps16, and root was maintained. Changelog: https://download.lineageos.org/devices/pro1x/changes

I use fastboot for flashing pro1/QX1000 just fine. Why does it not work for yours? I have no idea on the edl file. Will check if I got one downloaded somewhere, but i doubt it.

Have you tried following the guide linked by my initial post pinned in here?

Yes, I already tried them but most of them are for flashing with fastboot and that's no oppurtunity for this device. The required files (firehose_progammer.edl) are missing. Maybe I could use a Firehose file from a different device which uses the same CPU (SD835)?

The only way I could ever get anything approaching reliable cell tower connection was by setting the phone to connect by WCDMA only. T-Mo has now shut that service down in the US, so that pretty much bricks the device as a phone now. Mine always had decent WiFi connection, so maybe you could get VoWiFi working when you have a hotspot, but that's probably all. If you figure this out, you'd be the first. Good luck!