It took me a while, but I got LineageOS running on my Fxtec Pro1 X by following the guide here:
https://wiki.lineageos.org/devices/pro1x/install/
However, I ran into issues when trying to run these fastboot commands:
fastboot oem enable-charger-screen
fastboot oem off-mode-charge 1
fastboot reboot
Fastboot reported that no devices were found. Ok, so that's a driver problem. But, I couldn't figure out how to install the Google USB Drivers for Android on Windows 11:
https://developer.android.com/studio/run/win-usb
After doing a lot of digging, I found a video in R