Press the SETUP button on your remote control to bring up the on-screen GUI. Navigate to Firmware: Select General → Firmware .
Ensure your AVR-X4000 has a stable, wired Ethernet connection if updating over a network. denon avr x4000 firmware update upd
Once finished, "Complete" will appear on the front display, and the unit will return to its normal state. 3. Update via USB Memory Press the SETUP button on your remote control
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) Once finished, "Complete" will appear on the front
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.
Updating firmware is a critical process. To avoid "bricking" your unit, follow these precautions: