[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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Thank you very much for the images. I was able to try on the RP-N53 as right now I don't have the WHR-600D available.
You can find the full boot log and iw list output attached: there is a definite step forward as the 5Ghz radio is now properly detected and if I put it in master mode other devices are able to see the network. The only problem is that when a device tries to connect it always times out, and in dmesg there are errors like

[   51.934086] ieee80211 phy0: rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x0000, type=4
[   60.094043] ieee80211 phy0: rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x0065, type=4
[   60.128242] ieee80211 phy0: rt2x00lib_rxdone: Error - Wrong frame size 0 max 3840

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=691#comment2381