: Updates often target improvements to the Denon Link HD function, which provides a jitter-free connection when paired with compatible Denon Blu-ray players by sharing a common master clock.
This article provides community-sourced troubleshooting. Denon official support for the X4000 ended in 2018. Proceed with updates at your own risk. Always back up your settings via the web interface (http://[X4000-IP-address]/goform/saveUserSettings) before updating. Denon Avr X4000 Firmware Update