shame - mine wasn’t hooked up, thus spurious in/out - can you at least send a sound file to it, there are plenty to try from Elektron site, or even backups you may have - just to narrow down what the issue is, try another cable and don’t do the upgrade from the early start menu (power + Fn) - puzzling, can you hook it up to a usb sequencer pc/mac to even play it remotely ?! - see if there’s a h/w issue !