: To verify your current firmware, navigate to the receiver's menu via the remote: Setup > General > Firmware > Check for Update .

The most reliable way to get the latest firmware is through official channels to avoid corrupting your receiver. Visit the . Search for "AVR-X520BT firmware".

Insert your prepared USB flash drive firmly into the dedicated of the receiver.

Firmware updates may reset some of your settings to default. Take note of your speaker configurations or save them if possible 1.2.3.