Because this model lacks a built-in Ethernet or Wi-Fi connection for direct updates, you must use a physical USB drive.
The unit will display on the front panel. Denon Avr-x520bt Firmware Download
Press the button on your remote control to open the on-screen menu. Navigate to General > Firmware . Because this model lacks a built-in Ethernet or
: Place the unzipped firmware file into the root directory of the USB drive (not inside a folder). Insert and Initiate : Denon Avr-x520bt Firmware Download