Txnr646 Firmware Update 2021 !new! -

For those still using the Onkyo TX-NR646

, the firmware update situation in 2021 was a bit of a mixed bag. While newer models like the TX-NR696

received significant features that year—such as Klipsch Optimized Mode and expanded SONOS device support—the largely transitioned into maintenance mode. The December 2020/2021 Baseline The most "recent" significant update for the

was released on December 1, 2020, and served as the baseline for 2021. This update was critical for stability, addressing:

Web Setup Fixes: Resolved issues where customer settings could not be changed via the web menu.

Sirius XM Fixes: Corrected song information display issues for Sirius XM radio.

General Stability: Ongoing minor bug fixes to prevent audio dropouts during certain content playback. Community Tips & Warnings Since the

is a 2015-era model, forum users in 2021 shared several "lessons learned" to keep these units running:

The "USB Over WiFi" Rule: Long-time owners strongly recommend avoiding network updates (WiFi/Ethernet). Many users on Reddit reported "bricks" or endless "Now Initializing" loops when updating over the air.

Manual Updates: If your receiver hasn't been updated, it's safer to download the files to a USB drive (formatted to FAT32) and update through the front panel.

Dolby Vision Limitations: Despite various updates, many users confirmed that the TX-NR646 does not support Dolby Vision passthrough for all devices (like the 2019 Shield Pro), and no 2021 firmware fixed this hardware-limited capability. Checking Your Version

To see if you are on the final stable version, navigate to:Setup → 8. Misc → Firmware Update.The latest reported version number for this model is typically around 1110-5060-1106. txnr646 firmware update 2021

Title: The Silent Revolution: A Deep Dive into the TXNR646 2021 Firmware Update

In the landscape of consumer electronics, firmware updates are often mundane affairs—minor bug fixes or compatibility patches that go unnoticed by the average user. However, for owners of the Onkyo TX-NR646 A/V receiver, the firmware update released in 2021 represented a significant milestone. It was not merely a repair; it was a functional resurrection for a device caught in the crossfire of the streaming wars.

To understand the gravity of the 2021 update, one must first understand the context of the hardware. The TX-NR646 was a highly regarded mid-range receiver, praised for its robust power and early adoption of Dolby Atmos and DTS:X. However, as the streaming landscape evolved, the hardware began to show its age—not in audio fidelity, but in connectivity logic. The 2021 firmware addressed this, fundamentally altering the user experience.

Part 5: Known Issues After the 2021 Update

While the 2021 firmware fixed many problems, it introduced two minor quirks (which Onkyo never patched because support ended):

  1. Slow GUI response: The on-screen menu takes 1–2 seconds longer to appear compared to 2018 firmware. This is due to the heavier video handshake protocols.
  2. Zone 2 volume scaling: If you use Zone 2, the volume steps are now smaller (requires more remote clicks).
  3. No HDMI 2.1: Remember, the TX-NR646 hardware is HDMI 2.0. The 2021 firmware does not add 4K/120Hz or VRR. That requires a new receiver.

Verdict: The pros outweigh the cons. The audio stability alone is worth updating.

How to Update Your TX-NR646 to the 2021 Firmware

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.

Method B: Via USB (Use only if Network Update fails)

If the Onkyo servers are down or your network card is having issues, you can perform a USB update.

  1. You need a USB flash drive formatted to FAT32.
  2. You must download the specific .bin file from the Onkyo support site.
    • Current Status: As of late 2023/2024, Onkyo has merged support pages under the "Onkyo & Pioneer Corporation" website. Navigate to the Support page for TX-NR646 and look for the "Firmware" tab.
  3. Extract the file and place it in the root directory of the USB drive (do not put it inside a folder).
  4. Plug the USB into the front panel USB port.
  5. On the receiver remote: Setup > Hardware > Firmware Update > Update via USB.

Q: Will the update erase my AccuEQ settings?

A: No. Speaker calibration settings are preserved. However, network and HDMI settings may reset to factory defaults.

Troubleshooting Common Update Issues

If you try to update and it fails:

  1. Network Error: Unplug the router and the receiver for 1 minute. Plug the router back in first, wait for it to boot, then plug in the receiver.
  2. "Update Failed" Loop: If the receiver is stuck in a loop saying "Update Failed," you may need to perform a Factory Reset.
    • How to Reset: While holding down the CBL/SAT button on the front panel, press the ON/STANDBY button. "Clear" should appear on the display. (Note: This erases all your radio presets and speaker calibrations).

The Onkyo TX-NR646 remains a highly capable 7.2-channel network A/V receiver, but keeping its software current is crucial for peak performance. The latest official firmware update for the Onkyo TX-NR646 was released in December 2020 (version 1.15). While no new updates were issued in 2021, many users sought out and installed this specific version throughout 2021 to address ongoing system bugs.

This guide details what the update does and provides step-by-step instructions on how to install it safely. 🛠️ Key Fixes in the Final Firmware Update For those still using the Onkyo TX-NR646 Go

The December 2020 release resolved several persistent legacy issues:

Web Setup Menu: Fixed the glitch preventing users from changing customer settings via web browsers.

SiriusXM Radio: Fixed the bug where song and artist information failed to display on the receiver's screen. ⚠️ Critical Precautions Before You Begin

Updating firmware carries a risk of bricking your device if interrupted. Follow these rules strictly:

Timeframe: The update typically takes 30 to 40 minutes to complete.

Power Supply: Never pull out the power cord or shut off the unit while the update is running.

Connection Stability: If updating over a network, a poor connection can cause the process to fail or take over 2 hours. 📋 How to Check Your Current Firmware Before proceeding, check if you actually need the update: Press the Setup button on your remote or front panel. Highlight 8. Misc and press Enter. Select 8.1 F/W Update and press Enter.

Look at the 12-digit number. Compare it against the latest files available on the Onkyo Support Portal . 💾 Step-by-Step Update via USB (Recommended)

Updating via a USB thumb drive is much safer than utilizing a wireless network connection. Step 1: Prepare the USB Drive

Insert a standard USB flash drive into your computer and format it (ensure it is empty).

Download the firmware files directly from the Onkyo Product Page . Right-click the downloaded ZIP file and select Extract All. Slow GUI response: The on-screen menu takes 1–2

Copy the entire contents of the extracted folder directly to the root directory of your USB drive. Do not place them inside another folder. Safely eject the drive from your PC. Step 2: Install on the Receiver

Insert the USB drive into the USB port on the front or back of the receiver. Power on the receiver and your connected TV. Press Setup on the front panel or remote. Navigate to 8. Misc > 8.1 F/W Update. Scroll down to select Update via USB and press Enter. Confirm and begin the update.

Do not touch the unit until the front display reads "Complete". The receiver will automatically shut off or prompt you to reboot. 🌐 Alternative: Update via Network

If your receiver is connected directly to the internet via an Ethernet cable or strong Wi-Fi, you can update without a PC: Press the Home button on your remote. Go to System Setup or Setup > Miscellaneous. Select Firmware Update. Select Update via NET and press Enter.

Wait for the progress bar to finish on your TV or receiver display. Do not power off the unit until it states "Complete".

If you run into issues where the receiver freezes or fails to detect the update, you can perform a hard factory reset by holding down the CBL/SAT button and the Power button simultaneously until "Clear" appears on the display.

Are you experiencing a specific error code during the update, or are you looking to troubleshoot a hardware issue like a loss of audio?

Note: The specific model is the Onkyo TX-NR646 (a 7.2-channel network AV receiver released around 2015/2016). By 2021, this device was considered a legacy product, but Onkyo released critical stability and security patches for it.

The Late 2021 Minor Update (v2131-8030-5080)

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.”

No new security or feature updates were included.

Should You Still Update in 2025 and Beyond?

Even though we are past 2021, applying this firmware update is still strongly recommended if your TX-NR646 has not been updated since purchase. Here’s why:

Note: Onkyo has not released any official firmware for the TX-NR646 after 2021, meaning this is the last available update.