You could just leave it in airplane mode, but not being able to use the internet to pull down books from your Calibre-web server means you may as well just send books via Calibre.

That’s sadly true. I am thinking of waiting for the kindle to die too, but I was looking more at the onyx boox go 6, since I already know I can run whatever I want on there.

Pretty much, apart from that I often add them and only fix if necessary, e.g. they’re not going into series properly.

I see, thanks! Do you mind if I ask you where you can find them with some good metadata? My attempts have been not so good until now…