They sell the fairphone5 with e/os preinstalled, and there is an official build for fp5 including install guide (which is what I followed, just make sure to use official and not community build as you can’t relock the boot loader with the community versions).
https://doc.e.foundation/devices/FP5/install
putting e/os on fairphone 5; murena and the e/os project site implied to me that it only supported fairphone 1 the last time i checked.
They sell the fairphone5 with e/os preinstalled, and there is an official build for fp5 including install guide (which is what I followed, just make sure to use official and not community build as you can’t relock the boot loader with the community versions). https://doc.e.foundation/devices/FP5/install