[FS#691] 5Ghz radio detected as 2.4Ghz and not-functional on Asus RP-N53 and Buffalo WHR-600D (Ralink RT5592)

[LEDE Bugs]

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FS#691 - 5Ghz radio detected as 2.4Ghz and not-functional on Asus RP-N53 and Buffalo WHR-600D (Ralink RT5592)
User who did this - kbios (kbios)

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According to ifconfig the mac address is e0:3f:49:91:fe:16, you can find the factory partition attached. I can confirm it's using 5Ghz:

root at LEDE:~# iw dev wlan0 info
Interface wlan0
        ifindex 8
        wdev 0x2
        addr e0:3f:49:91:fe:16
        ssid RP
        type AP
        wiphy 0
        channel 48 (5240 MHz), width: 20 MHz, center1: 5240 MHz
        txpower 20.00 dBm

My blackberry also identifies it as 5Ghz (but cannot connect).
I can also confirm the latest image disables 2.4Ghz. Unfortunately the WHR-600D isn't mine, I cannot say when/if I'll be able to tinker with it :(
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https://bugs.lede-project.org/index.php?do=details&task_id=691#comment2389