: Plug the USB drive directly into the USB port on the front panel of the receiver. Do not use a USB hub or extension cable. Start the Update :

If things don't go according to plan, use these "field-tested" fixes: Firmware AVR-X520BT

Denon Avr-x520bt Firmware Update //free\\

: Plug the USB drive directly into the USB port on the front panel of the receiver. Do not use a USB hub or extension cable. Start the Update :

If things don't go according to plan, use these "field-tested" fixes: Firmware AVR-X520BT Denon Avr-x520bt Firmware Update