Ok Folks,

I've been struggling with this as well and I can provide some
information and help.

BACKGROUND:

First of all, there are at least four versions of the Broadcom BCM43602
SoC which is supported by the brcmfmac driver:

Source: https://wireless.wiki.kernel.org/en/users/drivers/brcm80211

BCM43602        14e4:43ba       Supported in 3.17+
BCM43602        14e4:43bb       Supported in 3.19+, 2 GHz device
BCM43602        14e4:43bc       Supported in 3.19+, 5 GHz device
BCM43602        14e4:aa52       Supported in 4.2+, “raw” device


You need to run lscpi -nn to determine which one you have installed. I happen 
to have the first one which ends on 43ba.

For a long period of time I was not able to get 5Ghz running on my wifi.
Running on 2.4Ghz Wifi was fine but the speeds were limited.

SOLUTION:

As it turns out, if you have ANY bluetooth device connected to your
laptop, the chip will reserve the 5GHz spectrum and your WiFi will only
work on 2.4Ghz. Weird. I know... My advise to you is to remove ALL
bluetooth devices completely from your Bluetooth manager. I am not
talking just turning off your bluetooth devices. I am talking about
complete unpairing them from your laptop. In my case, I had a bluetooth
mouse. I unpaired it from my laptop and immediately, my WiFi switched to
5Ghz!

Hope this helps anyone who is struggling with those chips.

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https://bugs.launchpad.net/bugs/1487524

Title:
  14e4:43ba Broadcom BCM43602 not seeing 5Ghz range

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