I have the same issue.
Brand new out of the box basically.
First, I powered it up once but the unit didn't do anything except showing "Keystep Pro" (or something) on the OLED. No other LEDs or screens were lighting up and none of the buttons were responsive. After about 5 minutes of this I thought maybe it will work after a first firmware update.
I opened MCC, got an error message at about 50% through the update and the KSP has been dead since.
I'm on Mac OSX Catalina
This FAQ doesn't help since neither the device nor its update are showing up again in Audio-Midi-Setup after removing the device once:
https://www.arturia.com/faq/utilization/midi-control-center-fail-to-open-the-device-on-mac-osxhttps://www.arturia.com/faq/utilization/midi-control-center-fail-to-open-the-device-on-mac-osxI contacted support just now but as it's the weekend I guess both options - returning the unit or finding a solution - will include me sitting in front of expensive paperweight for a few days.
Can't say I'm not frustrated tbh.
I was hoping to read how you guys were able to get yours back to life as some were announcing they got theirs to work.
However, i didn't find more info than "usb disconnect, connect clock in to reset out, power on, disconnect clock, connect usb, open MCC, download FW and manually update within MMC"...
... which doesn't work for me.
Guess gotta rearrange my gear back to before KSP arrival for now.
Any help appreciated.
Thanks