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In rare cases, issues with USB playback or other functions may persist even after a successful update. Performing a full microprocessor initialization can clear any residual software conflicts.
Updating your receiver's firmware optimizes system performance, patches Bluetooth connectivity bugs, and resolves HDMI passthrough handshake issues with older 4K Ultra HD hardware. Why Firmware Updates Matter for the AVR-X520BT
The receiver will read the USB drive and begin writing the update. The display will show the progress (e.g., "Updating... XX%").
Denon periodically releases firmware updates for the AVR-X520BT. Some recent updates have included:
: Use a drive with less than 32 GB for maximum system compatibility.
