The includes instructions for firmware recovery via USB, but it does not include the firmware file itself. Why? Because Yamaha frequently updates firmware (e.g., v1.44 fixes HDMI 2.1 bug).
For qualified technicians, the manual outlines critical reset and diagnostic steps: yamaha rx-a2a service manual
For the (part of Yamaha’s Aventage line, 7.2-channel 8K HDMI receiver), the service manual is essential for: The includes instructions for firmware recovery via USB,
You can find the Yamaha RX-A2A service manual on various online platforms, such as: 7.2-channel 8K HDMI receiver)