Denon prime 4 mixer not updating

ive tried to update the prime 4, but now my mixer doesn’t work help

Which source did you use to update: from a USB stick, from a computer or from the web? Have you tried to redo the update?

try to restart the update! But do it via USB connection to a PC or Mac! To bring the controller into the update mode press the View button for a few seconds when turning on the controller.

To my knowledge it’s holding EJECT while powering on. Cannot test it myself btw.