The pros outweigh the cons. The audio stability alone is worth updating.
txnr646 firmware update 2021, Onkyo TX-NR646 2021 patch, TX-NR646 Dolby Vision fix, Onkyo firmware 2130-1010-0200, update TX-NR646 via USB.
As of 2023, Onkyo has largely ended active support for the TX-NR646. However, the 2021 update remains the final and most stable official firmware for this model. This article covers everything you need to know about that specific update: version numbers, how to install it (USB vs. Network), bug fixes, and post-update performance.
Press on your remote and navigate to System Setup > Miscellaneous > Firmware Update . If an update is available, select Update Via NET .
If you are still using a TX-NR646 in 2026, this 2021 update remains the final stable release.