Enhanced interference management missing in latest ASUS RT-N66U firmwares?

[rpeters83]

I just realized that it's missing, after I upgraded from an older firmware. SHOULD this be there? I see there's an option for it in the source code, but it's not displaying on the screen.

I'm using 3.0.0.4.372_1363 and am on the Wireless => Professional window for 2.4ghz. Thanks.