Transfer all unzipped files directly to the root directory of your USB drive.
If you are looking for a specific update released in 2021, it was likely related to .
(often referred to in 2021 discussions as the current "latest" version). While Onkyo released updates for newer models throughout 2021, the TX-NR646—a 2015 model—received its final critical maintenance patch at the end of 2020 to address web menu and satellite radio issues. Update Highlights (Version 1.15) Web Setup Fix txnr646 firmware update 2021
You have two methods. for convenience, but USB is more reliable if your Wi-Fi is slow.
: Fixed a bug that prevented song information from displaying correctly during Sirius XM radio playback. Stability & Compatibility Transfer all unzipped files directly to the root
Format a USB flash drive (32GB or smaller) to the FAT32 file system on your computer.
Press the Setup button on your remote. Navigate to Misc > Firmware Update to view your current version. While Onkyo released updates for newer models throughout
: Once the "Complete" message scrolled across the display, the transformation was immediate. The Spotify Connect lag vanished, and his 4K Blu-ray player finally synced with the receiver in seconds rather than minutes.
Press Setup on your remote, go to Misc , select Firmware Update , and choose Update via USB . Execute the Patch: Select Update and press Enter.
To understand the gravity of the 2021 update, one must first understand the context of the hardware. The TX-NR646 was a highly regarded mid-range receiver, praised for its robust power and early adoption of Dolby Atmos and DTS:X. However, as the streaming landscape evolved, the hardware began to show its age—not in audio fidelity, but in connectivity logic. The 2021 firmware addressed this, fundamentally altering the user experience.
, a is often more reliable than a network update to avoid "bricking" the device during the process. Troubleshooting Tips (2021 & Beyond) :