As of this article, the top stable version is FH456_V15.03.06.50_multi . Always verify the date on Tenda’s download page for any newer release.
With the update complete, John turned his attention to the network. He checked the connections, made sure the Wi-Fi was working properly, and verified that all devices were online. The network was humming along smoothly, thanks to the updated firmware. tenda fh456 firmware update top
: Always perform the update via a wired connection. Updating over Wi-Fi is risky; if the signal drops during the process, it can "brick" the router (render it permanently unusable). As of this article, the top stable version is FH456_V15
If the router is completely unresponsive: As of this article