Ubuntu 15.10 with the firmware 1.149 package:                    

~$ lspci | grep Network
         04:00.0 Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)

~$ dpkg -l | grep firmware
         ii  linux-firmware                                              1.149 

I can see that the device supports 5 GHz, but it still can't see any 5 GHz networks.

~$ iwlist wlp4s0 freq
wlp4s0    32 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 36 : 5.18 GHz
          Channel 40 : 5.2 GHz
          Channel 44 : 5.22 GHz
          Channel 48 : 5.24 GHz
          Channel 52 : 5.26 GHz
          Channel 56 : 5.28 GHz
          Channel 60 : 5.3 GHz
          Channel 64 : 5.32 GHz
          Channel 100 : 5.5 GHz
          Channel 104 : 5.52 GHz
          Channel 108 : 5.54 GHz
          Channel 112 : 5.56 GHz
          Channel 116 : 5.58 GHz
          Channel 120 : 5.6 GHz
          Channel 124 : 5.62 GHz
          Channel 128 : 5.64 GHz
          Channel 132 : 5.66 GHz
          Channel 136 : 5.68 GHz
          Channel 140 : 5.7 GHz
          Current Frequency:2.462 GHz (Channel 11)

~$ sudo iwlist wlp4s0 scan | grep -e Freq -e SSID
                    Frequency:2.462 GHz (Channel 11)
                    ESSID:"Mistico"
                    Frequency:2.412 GHz (Channel 1)
                    ESSID:"Telstra1D5A"
                    Frequency:2.437 GHz (Channel 6)
                    ESSID:"HP-Print-42-Officejet Pro 8600"
                    Frequency:2.437 GHz (Channel 6)
                    ESSID:"Living room"

~$ iw phy [5 GHz Section]
		Frequencies:
			* 5170 MHz [34] (disabled)
			* 5180 MHz [36] (20.0 dBm)
			* 5190 MHz [38] (disabled)
			* 5200 MHz [40] (20.0 dBm)
			* 5210 MHz [42] (disabled)
			* 5220 MHz [44] (20.0 dBm)
			* 5230 MHz [46] (disabled)
			* 5240 MHz [48] (20.0 dBm)
			* 5260 MHz [52] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5280 MHz [56] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5300 MHz [60] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5320 MHz [64] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5500 MHz [100] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5520 MHz [104] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5540 MHz [108] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5560 MHz [112] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5580 MHz [116] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5600 MHz [120] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5620 MHz [124] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5640 MHz [128] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5660 MHz [132] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5680 MHz [136] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5700 MHz [140] (20.0 dBm) (no IR, radar detection)
			  DFS state: usable (for 2969 sec)
			  DFS CAC time: 60000 ms
			* 5720 MHz [144] (disabled)
			* 5745 MHz [149] (disabled)
			* 5765 MHz [153] (disabled)
			* 5785 MHz [157] (disabled)
			* 5805 MHz [161] (disabled)
			* 5825 MHz [165] (disabled)

Help.