I guess it should be added in this thread that PureOS byzantium can be flashed onto the Librem 5 – note that this removes anything that was on it before, all data is lost – using the librem5-flash-image script in the librem5-devkit-tools repository (see https://developer.puri.sm/Librem5/Development_Environment/Phone/Troubleshooting/Reflashing_the_Phone.html). To get byzantium, simply use the --dist byzantium option like this:
sudo ./scripts/librem5-flash-image --dist byzantium
Or in my case because I have a Birch device, I use this command where “librem5r2” means Birch or Chestnut:
sudo ./scripts/librem5-flash-image --dist byzantium --board librem5r2
So that’s a convenient way if you want to try out PureOS byzantium, as long as you don’t mind reflashing and thereby losing all your settings and data from your old installation. You can see the different options for the flashing script using this command:
./scripts/librem5-flash-image -h