• The router is a LinkSys WRT150N. No version is shown on the device. The serial number begins CQ6..
• Did a 30/30/30 reset
• Joined a laptop to the router with a patch cable
• Configured the laptop as 192.168.1.2
• Browsed to 192.168.1.1
• Username: admin, Password: admin
• Navigated to Administration, Firmware Upgrade
• Uploaded http://downloads.openwrt.org/kamikaze/8.09.2/brcm-2.4/openwrt-wrt150n-squashfs.bin

After a short while, nmap -F 192.168.1.1 showed:

PORT   STATE SERVICE
22/tcp open  ssh
23/tcp open  telnet
53/tcp open  domain
80/tcp open  http

image conversion

route add default gw 192.168.1.2  # assuming .2 is your laptop
vi /etc/resolv.conf  # to tell OpenWrt where the DNS recursor is
opkg update
opkg install kmod-brcm-wl-mimo
reboot

The brcm47xx flavour of 10.03.1 will yield:

b43-phy0: Broadcom 4321 WLAN found (core revision 11)
b43-phy0 ERROR: FOUND UNSUPPORTED PHY (Analog 5, Type 4, Revision 1)
b43: probe of ssb1:0 failed with error -122

..in the kernel log and no wireless interface.

/proc/cpuinfo:

system type		: Broadcom BCM4704 chip rev 9
processor		: 0
cpu model		: BCM3302 V0.6
BogoMIPS		: 263.78
wait instruction	: no
microsecond timers	: yes
tlb_entries		: 32
extra interrupt vector	: no
hardware watchpoint	: no
VCED exceptions		: not available
VCEI exceptions		: not available

/proc/pci:

PCI devices found:
  Bus  0, device   0, function  0:
    Class 0501: PCI device 14e4:0800 (rev 9).
      IRQ 3.
      Non-prefetchable 32 bit memory at 0x18000000 [0x18000fff].
      Non-prefetchable 32 bit memory at 0x1fc00000 [0x1fffffff].
      Non-prefetchable 32 bit memory at 0x1c000000 [0x1dffffff].
      Non-prefetchable 32 bit memory at 0x1a000000 [0x1bffffff].
  Bus  0, device   1, function  0:
    Class 0200: PCI device 14e4:4713 (rev 9).
      IRQ 4.
      Master Capable.  Latency=64.  
      Non-prefetchable 32 bit memory at 0x18001000 [0x18001fff].
  Bus  0, device   2, function  0:
    Class 0200: PCI device 14e4:4713 (rev 9).
      IRQ 5.
      Master Capable.  Latency=64.  
      Non-prefetchable 32 bit memory at 0x18002000 [0x18002fff].
  Bus  0, device   3, function  0:
    Class 0c03: PCI device 14e4:4715 (rev 9).
      IRQ 6.
      Non-prefetchable 32 bit memory at 0x18003000 [0x18003fff].
  Bus  0, device   4, function  0:
    Class 0604: PCI device 14e4:0804 (rev 9).
      IRQ 2.
      Non-prefetchable 32 bit memory at 0x18004000 [0x18004fff].
      Non-prefetchable 32 bit memory at 0x8000000 [0xfffffff].
  Bus  0, device   5, function  0:
    Class 0b30: PCI device 14e4:0816 (rev 9).
      IRQ 2.
      Non-prefetchable 32 bit memory at 0x18005000 [0x18005fff].
  Bus  0, device   6, function  0:
    Class 0703: PCI device 14e4:4712 (rev 9).
      IRQ 2.
      Non-prefetchable 32 bit memory at 0x18006000 [0x18006fff].
  Bus  0, device   7, function  0:
    Class 1000: PCI device 14e4:4718 (rev 9).
      IRQ 2.
      Non-prefetchable 32 bit memory at 0x18007000 [0x18007fff].
  Bus  0, device   8, function  0:
    Class 0500: PCI device 14e4:080f (rev 9).
      IRQ 3.
      Non-prefetchable 32 bit memory at 0x18008000 [0x18008fff].
      Non-prefetchable 32 bit memory at 0x0 [0x7ffffff].
      Non-prefetchable 32 bit memory at 0x10000000 [0x17ffffff].
      Non-prefetchable 32 bit memory at 0x80000000 [0x9fffffff].
  Bus  1, device   0, function  0:
    Class 0600: PCI device 14e4:4704 (rev 9).
      IRQ 2.
      Master Capable.  Latency=64.  
      Non-prefetchable 32 bit memory at 0x40000000 [0x40001fff].
      Prefetchable 32 bit memory at 0x0 [0x7ffffff].
  Bus  1, device   1, function  0:
    Class 0280: PCI device 14e4:4321 (rev 1).
      IRQ 2.
      Master Capable.  Latency=64.  
      Non-prefetchable 32 bit memory at 0x40004000 [0x40007fff].