I bought a used one, you first need to hook it up to a monitor so you can see the menu,
download the manual if you don’t have one. I read it on-screen, print selected pages, make notes for now and if I need them later.
do a reset
download and install latest firmware
make whatever settings others advise you to do.
now move it to the music system.
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if you think you may also use it as a streamer, you could learn/make setting changes now, or plan on moving it to a monitor to see the menu (or monitor to it) to set up streaming settings.