Once finished, "Complete" will appear on the front display, and the unit will return to its normal state. 3. Update via USB Memory
Choose Check for Update . The AVR will communicate with Denon's servers. denon avr x4000 firmware update upd
Updating firmware is a critical process. To avoid "bricking" your unit, follow these precautions: Once finished, "Complete" will appear on the front
Visit the official Denon Support page and download the firmware file specific to the AVR-X4000. The AVR will communicate with Denon's servers
If an update is available, select Start or Update Now . The unit will display the remaining time and the power indicator will turn red during the process.
Do NOT turn off the power or remove cables while the update is in progress. The process can take approximately 1 hour . 2. Update via Network (Recommended)
Use this method if your network is unstable or the online update fails.