Users attempting to pass 4K 60Hz signals from newer gaming consoles (PlayStation 5 and Xbox Series X) or high-end PC GPUs often encountered "handshake" failures—a frustrating scenario where the TV would go blank or show static because the receiver couldn't authenticate the high-bandwidth signal fast enough.
You can upgrade the system code using an Ethernet network or a standard USB flash drive. Feature / Detail Update via Network (NET) Update via USB Storage Active LAN/Ethernet connection FAT16 or FAT32 formatted flash drive Average Time 30 to 60 minutes 20 to 30 minutes Risk Level Moderate (Network drops can fail) Low (Highly reliable offline transfer) File Extraction Not required (Automatic) Required on a computer first
Download the exact 2021 firmware ZIP file from the official Onkyo support portal.
: When "Completed!" appears on the front panel, press ON/STANDBY on the main unit to enter standby mode. Method 2: Via USB Drive txnr646 firmware update 2021
over Wi-Fi to avoid common network errors (like the "0-21" or "0-04" errors). Preparation
: If the update stalls, try unplugging all HDMI video sources and restarting the process. Users have found success after removing these cables during the update.
: Press SETUP on the front panel, go to 8. Misc > 8.1 F/W Update , and scroll to find the Version number. The Target : Your version should be 1110-6060-1106 . Users attempting to pass 4K 60Hz signals from
: Turn off any control devices (like a PC) connected via Ethernet. Update Method 1: Via Network (Recommended)
Given the age of the receiver and the end of its software support, you may encounter issues.
: Plug the USB drive into the receiver's USB port. : When "Completed
, the firmware update situation in 2021 was a bit of a mixed bag. While newer models like the TX-NR696 Go to product viewer dialog for this item.
Press the button on the main unit to put the receiver into standby mode. Method 2: Updating via USB Flash Drive
This is the preferred method if your TX-NR646 has never been updated or if the network update fails.
: Many users have reported flaky network features. If your firmware is current and issues persist, a factory reset (hold CBL/SAT + On/Off ) can sometimes clear persistent bugs.
Show you in your region. Guide you through the factory reset process step-by-step.