If you have HDMI compatibility issues, use a modern HDMI 2.1 switch or an HDFury device to handle the handshake before the signal reaches the Denon.

: If your unit is stuck in a protection loop or has no audio, it is often a hardware failure (such as a faulty HDMI board) rather than a firmware issue. How to update my Denon AVR - Find Answers

is the most effective "patch" to clear corrupted configuration data. Community Firmware : There are rare community-led efforts on forums like