well I give up too.
first you issue a wild generalised warning that using tools & plug ins in calibre, to send (unspecified) books to H2O will horrendously corrupt the H2O.
then, when challenged, you back off from that & are semingly not interested in figuring out what really happened.
later you say (#23) that your books are actually from amazon, on a mac but you can't shift them to H2O,
then you contradict & say (#25)you don't need to buy books from amazon....
what ever your problem(s are/were I'm obviously not understanding , so that's me done on this thread, except to advise other wanting basic
how to set up their H2o device to seek it elsewhere
& why an almost square device needs a landscape mode eludes me also, but hey, send it back if it's too complex for you , read the specs before you order next time
there's no landscape mode in any of my paperbacks either, unless I go learn how to read sideways, but I'm not returning them
I'm done here