| Error Code / Symptom | Likely Cause / Solution | | :--- | :--- | | "Firmware Update" grayed out | The receiver is busy booting up; wait a few minutes and try again (Search Results 10). | | *-01 , *-10 (USB method) | USB storage device not found. Check if the USB is properly inserted, has no security locks, and is formatted correctly (Search Results 10). | | *-05 , *-13 , *-20 , *-21 | The firmware file is , is corrupted, or is for a different model. Retry the download and ensure the files are in the root directory (Search Results 10). | | *-02 , *-03 , *-04 , *-11 | Internet connection error. Check if your router is on and the Ethernet cable is secure. Reset your router and try again (Search Results 15, 16). | | Other Errors | Disconnect the AC power cord from the receiver, wait 30 seconds, plug it back in, and retry the update from the beginning (Search Results 10, 15). |
Before attempting to update, it is crucial to be aware of the risks and necessary preparations to avoid damaging your device.
: Go to 7. Miscellaneous (or 8. Misc depending on your current version) → Firmware Update . Select Network : Choose Update via NET and press ENTER . txnr646 firmware update 2021
Select and press Enter to begin the download and installation.
: Format a clean USB flash drive to FAT16 or FAT32 . | Error Code / Symptom | Likely Cause
You can, but you remain vulnerable to HDMI handshake issues with newer devices and network security flaws. It’s a low-risk update with high benefit.
: Ensure no audio or video is actively playing through the receiver. | | *-05 , *-13 , *-20 ,
Here is everything you need to know about that specific update, what it fixed, and how to install it.
: Use a wired Ethernet cable instead of Wi-Fi for maximum stability.
If the receiver says it is updated but you are having issues, try the USB update method, as it sometimes bypasses checks that network updates miss. FAQ: TX-NR646 Updates in 2026