to see if a hardware-level update is available for your unit?
The patched firmware update for the Denon AVR-591 addresses the following issues:
has a front-panel USB port, it is designed primarily for direct connection and control of iPods/iPhones denon avr591 firmware update patched
: Patching bugs related to HDMI handshake failures with newer 3D or 1080p devices.
and playing MP3/WMA/AAC files from USB drives, rather than user-led firmware flashing. Reported "Patch" Fixes & Known Issues to see if a hardware-level update is available for your unit
If you have an AVR-591 and have been hesitant to connect it to the internet, the coast is now clear. However, with legacy hardware, caution is always advised. Here is the safest way to ensure your unit is running the patched firmware:
As of April 2026, Denon no longer actively releases new firmware for 2010-era models like the Reported "Patch" Fixes & Known Issues If you
It’s important to temper expectations. Even the fully patched Denon AVR-591 cannot overcome hardware limitations:
