: Resolves sporadic digital audio drops occurring during playback of specific high-bitrate multi-channel audio.
Copy the unzipped files to the root folder of a USB flash drive.
Unzip the file and copy the contents to a FAT16 or FAT32 formatted USB stick. Plug the USB into the front panel port of the Go to > Misc > F/W Update > "Update via USB" . Troubleshooting Tips for 2021
Copy the entire contents of the extracted folder directly to the root directory of your USB drive. Do not place them inside another folder. Safely eject the drive from your PC. Step 2: Install on the Receiver txnr646 firmware update 2021
: Older units may experience "DSP" update hangs (e.g., stopping at 70% or 90%), which can sometimes indicate a failing internal memory chip rather than a software bug. How to Update
Core operational code stabilizes background communication, minimizing memory issues that lead to digital signal processor (DSP) faults. Key Specifications: TX-NR646 Firmware
If your main firmware number is lower than 21110-11010-1210, you are eligible for the 2021 update. : Resolves sporadic digital audio drops occurring during
Legacy music streaming services within Onkyo’s proprietary "Onkyo Controller" app were failing to authenticate. The update replaced outdated API endpoints for , restoring login functionality.
If you need those features, you must upgrade to a newer model like the TX-NR696 or TX-NR7100.
For existing owners, the 2021 update is the for the TX-NR646. Onkyo has since moved on, but this update ensures the NR646 remains a capable, if aging, heart of a budget home theater system. Plug the USB into the front panel port
If the progress bar stops moving for more than 30 minutes, do not unplug the power. Press and hold the button on the main unit for 5 seconds to force a safe reboot, then attempt the update via USB. To help tailor any further assistance, let me know: Are you currently facing a specific error code ? Which update method (USB or Network) do you plan to use?
The process typically takes . Do not turn off the power until "Completed!" appears on the front display. Via USB
Before attempting any update, it is best to check which firmware version is currently installed. To do this:
Before updating, check your firmware version via the on-screen display:
If your display reads , your receiver is fully up to date and no further action is required. Preparation and Safety Precautions Firmware Update TX-NR646 & TX-NR747 (12-01-2020) - Onkyo