If you cannot find the official firmware file on Denon's website (as they often archive support for older units), the best option is to contact an authorized Denon service center. They can apply the "patched" firmware directly to the board. Troubleshooting After Updating
The final firmware release focuses entirely on system stability and hardware compatibility.
Many users report that the AVR-591 struggles with DD+ signals sent from smart TV apps (like Netflix or Disney+) via HDMI ARC. This can result in chirping, crackling, or complete audio loss. denon avr591 firmware update patched
If HDMI audio drops out, use an Optical (Toslink) or Coaxial cable for audio from the source, while keeping HDMI for video.
Solves problems where the screen goes black, flickers, or fails to detect a signal when switching between a PS4/PS5, Xbox, or newer Blu-ray players. If you cannot find the official firmware file
There is no "official" patch for features like , which the
Better stability when using Audio Return Channel with compatible TVs. How to Check Your Denon AVR-591 Firmware Version You can check the current firmware version of your Many users report that the AVR-591 struggles with
: Resolving rare instances of audio dropouts during surround sound decoding.
Click or Load File and select the patched AVR-591 firmware .bin file. Step 4: Flash the Firmware
Since Denon officially stopped supporting the AVR-591 (circa 2010-2011) years ago, there are no new official patches. However, this guide explains the that solves the most common modern failure of this unit: HDMI handshake issues and the "Protection Mode" loop .