Denon — Avr-x520bt Firmware Update Best
Users can verify their current version or lock settings to prevent accidental changes through the Setup Menu :
: If the update is interrupted, the unit may retry automatically. If it becomes stuck, verify that the USB is formatted correctly to FAT32 and the file is in the correct directory. No Updates Found : This model is a legacy product. If the Denon Update portal Denon Avr-x520bt Firmware Update