I'm a bit confused because the 3cx Website says that the T46S is still supported, but I'm getting a unsupported firmware (red letters) for my T46S. 66.86.0.5 is the firmware version. Is there another version coming out or has Yealink/3cx EOL this phone?
that just means you need to upgrade the firmware. check your system for updates, you should see it in your downloads. then apply to your phone. we have hundreds of T46S out there, they are still supported.