Denon Avr-x520bt Firmware Download 'link' -

A Windows PC (Mac sometimes works but Windows is safer), a USB flash drive (formatted to FAT32, 2GB to 32GB), and a stable internet connection.

To update the firmware on your Denon AVR-X520BT , you must use a USB memory device Denon Avr-x520bt Firmware Download

Since the AVR-X520BT does not have built-in Wi-Fi or an Ethernet port, updates must be performed manually via the on the front panel. A Windows PC (Mac sometimes works but Windows