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I highly recommend installing KoReader, especially for PDFs. Works on Kobo readers as well.

Is there already a port for the remarkable 2? It would be so nice to have a working epub reader...

I found YouTube videos help. Nice walkthroughs. Alot are for the first remarkable but I imagine in princable they work for both

Anything that uses the screen on the reMarkable will not work on the rM2 yet. https://github.com/ddvk/remarkable2-framebuffer is being worked on to address that.