: Fixing handshake issues with 4K/60Hz devices (as it supports HDCP 2.2 on three inputs).
Once the file is downloaded to your computer, you must prepare a USB thumb drive. Denon Avr-x520bt Firmware Download
Denon no longer distributes public download links for AVR-X520BT firmware. for safety and reliability. : Fixing handshake issues with 4K/60Hz devices (as
Official firmware files for "legacy" or discontinued models like the AVR-X520BT 2GB to 32GB)
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.
If your unit is not connected to the internet, you can perform a manual update via USB. This is where the "Download" aspect comes into play.