: 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.
The has been a beloved workhorse for home theater enthusiasts since its release, offering solid 4K support , Dolby Atmos , and DTS:X capabilities. While Onkyo frequently releases firmware updates, keeping older, capable units up to date is essential for maintaining network streaming services and fixing connectivity issues.
Select . Note that the update is only selectable if a newer version is available.
: Plug the USB drive into the receiver's USB port. txnr646 firmware update 2021
is version (or version 1.15). This update specifically aimed to:
It is strongly advised to . Multiple users have reported that it fails to work, likely because Onkyo has taken the server offline. The process for this method is:
If you are still using a TX-NR646 in 2026, this 2021 update remains the final stable release. : If the update stalls, try unplugging all
Press on your remote and navigate to System Setup > Miscellaneous > Firmware Update . If an update is available, select Update Via NET .
. While Onkyo distributed major network enhancements for successor models throughout 2021, users looking for a 2021 patch for the 2015-era
Fixes intermittent audio dropping issues over HDMI ARC connections. Prerequisites Before Updating : Plug the USB drive into the receiver's USB port
Download the firmware file from the official Onkyo Support website.
The 2021 firmware patch was not just a routine maintenance release. It addressed several long-standing performance bottlenecks inherent to the aging TX-NR646 architecture.
While the firmware update path is straightforward, users have reported significant hardware issues: