The AVR-591 supports Dolby TrueHD and DTS-HD Master Audio, but legacy firmware sometimes exhibited Bitstream decoding glitches—pop sounds, momentary dropouts, or incorrect channel mapping during high-bitrate content playback. Patched firmware tightened the audio processing pipeline on the DSP chips, reducing these artifacts. The service manual confirms that firmware updates can affect the Main, Sub, DSP ROM, and Audio PLD components, all of which play roles in audio decoding.
: Requires a physical connection via the receiver's internal service port.
When the AVR-591 first launched, it ran on firmware version or 00.60.12 (depending on regional manufacturing batches). Early adopters quickly reported: denon avr591 firmware update patched
Plug the 3.5mm end of your serial cable into the port on the back of the Denon.
Fixes for intermittent black screens with newer 4K devices. The AVR-591 supports Dolby TrueHD and DTS-HD Master
I can provide the exact software configurations or alternative troubleshooting tips based on your setup. Share public link
This comprehensive guide answers all those questions and more, drawing from Denon’s official documentation, user forums, service manuals, and hands-on community experience. : Requires a physical connection via the receiver's
However, it’s crucial to understand that installing unofficial, community-patched firmware voids any remaining warranty and carries significant risk. A failed flash can “brick” the receiver, requiring professional service and expensive hardware reprogramming. The official service manual explicitly warns that “an incomplete or corrupted firmware can cause a unit to not operate properly” and recommends contacting Denon Support if this occurs.
As Denon sunsets support for older products, official firmware downloads become harder to locate. Your options:
Denon AVR-591 Firmware Update Patched: Everything You Need to Know