To update the firmware on your Denon AVR-X520BT , you must use a USB memory device, as this specific model does not have built-in network connectivity for online updates. 1. Preparation
Note: The Denon AVR-X520BT is an entry-level model. Some advanced firmware features found in higher-end models (like Denon 2016 Remote App support) may not be applicable to this specific unit. Denon Avr-x520bt Firmware Update
No. The AVR-X520BT is hardware-limited to 5.2 channels and does not have the processing capability for Dolby Atmos. No firmware can change hardware limitations. To update the firmware on your Denon AVR-X520BT
If you are unsure if you need an update, you can check your current version through the system menu: HDMI handshake failures with Roku, Fire TV, or Apple TV 4K