: Interrupting the process can permanently damage the receiver's motherboard. Step-by-Step Update Guide
Without this update, your TX-NR646 will likely drop video signals with a PS5 or fail to display Dolby Vision from a new Chromecast. With the update, the unit runs quietly (fan logic improved), switches inputs faster, and supports the core features that matter.
By 2021, the TX-NR646 was no longer receiving new features (like HDR10+ or VRR, which the hardware doesn't support). However, this update focused on .
on December 1, 2020. While newer Onkyo models received updates in 2021 to address TIDAL security and TuneIn Radio stability, Onkyo support has confirmed no additional firmware updates available for the TX-NR646 beyond the late 2020 release Latest Available Firmware Details Version Number: 1110-6060-1106 Release Date: December 1, 2020 Key Fixes: txnr646 firmware update 2021
Format a standard USB flash drive (under 32GB) to or FAT32 file systems.
The update implements an overhauled OAuth login methodology. This shift addresses security enhancements required by the platform, stopping credential errors during network sign-ins.
You can update the TX-NR646 using one of two methods. : Interrupting the process can permanently damage the
You can update via network (if the server is still up) or via USB. The Onkyo official website recommends the USB method (Search Results 8, 9).
If you are still using a TX-NR646 in 2026, this 2021 update remains the final stable release.
If the update fails or hangs, avoid unplugging the power cord immediately. Try restarting the process if the unit remains responsive. By 2021, the TX-NR646 was no longer receiving
Decide between a network update (fastest) or a USB update (most reliable). Method 1: Updating via Network (Internet)
The internet connection dropped. Power cycle your router, plug an Ethernet cable directly into the receiver, and try again.
Onkyo TX-NR646 reached its final firmware version 1110-6060-1106
Some users reported post-update glitches. Here’s how to resolve them: