For owners of the Onkyo TX-NR646, 2021 represented a critical year for device maintenance. While the 7.2-channel THX-certified receiver had long been discontinued (succeeded by the NR676 and later models), Onkyo continued to push firmware updates to address lingering bugs, particularly those related to and HDCP 2.2 handshake issues with newer 4K streaming devices.
: 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. txnr646 firmware update 2021