2021: Txnr646 Firmware Update

No new security or feature updates were included.

If you are looking for a specific update released in 2021, it was likely related to . txnr646 firmware update 2021

There are two ways to update the firmware on the TX-NR646. if your receiver is connected to the internet. No new security or feature updates were included

: Plug the USB into the receiver. On the front panel or remote, go to 8.1 F/W Update Update via USB . The process typically takes 30 to 40 minutes Completion if your receiver is connected to the internet

: When "Completed!" appears on the front panel, press ON/STANDBY on the main unit to enter standby mode. Method 2: Via USB Drive

Users attempting to pass 4K 60Hz signals from newer gaming consoles (PlayStation 5 and Xbox Series X) or high-end PC GPUs often encountered "handshake" failures—a frustrating scenario where the TV would go blank or show static because the receiver couldn't authenticate the high-bandwidth signal fast enough.

Download the firmware ZIP file from the official Onkyo support page .