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Try this. The download links seem to work (I am not knowledgable on any of this)... https://web.archive.org/web/20200406195436/http://files.nwwn.com/android/pro1/factory.html

You might want to try asking in the unofficial Discord sever. It is much more active than here and some of the old timers who don't come here much hang out there from time to time. tdm is on Discord, but I have no idea if he will respond to DMs... he doesn't participate in the FxTec server although he is listed there. https://discord.gg/D5QkVZuc

Love you, man. That's great. Now, the problem is to understand how Method 1 (via PBL) for getting into EDL mode is used. If anyone knows which two pads need to be shorted and how it needs to be done, I would be very thankful. Also writing a mail to the user "tdm". Maybe, with a little bit of luck he'll respond.

Lineage-23.2-20260316-NIGHTLY-pro1x with March 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!