Txnr646 Firmware Update 2021 -

A: Try a different USB drive (older, smaller capacity – 512MB to 1GB works best). Also ensure you named the folder ONKUP exactly.

There are two ways to update the firmware on the TX-NR646. Method A is preferred if your receiver is connected to the internet.

If your TX-NR646 refuses to update to the 2021 firmware, try these fixes: txnr646 firmware update 2021

The TX-NR646 is an older model, and Onkyo has generally ceased releasing major feature updates for it.

There are two official methods to apply the txnr646 firmware update 2021: via network (Ethernet or Wi-Fi) or via USB. Onkyo recommends USB for the most reliable results, especially if your receiver currently has very old firmware. A: Try a different USB drive (older, smaller

In October 2021, Onkyo released a silent revision: v2131-8030-5080. This update only appeared for units that had already installed the February patch. Its only change was:

“Corrects an issue where the zone 2 speaker output would remain active after the main zone was powered off.” The TX-NR646 is an older model, and Onkyo

No new security or feature updates were included.

Cause: HDMI-CEC/ARC settings reset to defaults.
Fix: Go to Setup → Hardware → HDMI → Set HDMI CEC to On and Audio Return Channel to Auto.