@Daniel-Boese AFAIK there is no btrfs-module compiled for the official firmware, but obviously the easiest way of checking that would be to try and install one -- if you get an error, then there ain't one. I don't run official firmware, so I don't know what they got in their repos. Now, if there ain't one in the repos, you'll have to ask Onion-devs to compile it for you.