Void Main's WRT54G Tips
Source: http://voidmain.is-a-geek.net/redhat/wrt54g_revival.html
Linksys WRT54G Revival!
When might you use this tip? - If you forgot to set your "boot_wait" nvram setting and uploaded a bad firmware image which caused your router not to boot (like I did) - You failed every other instruction for reviving your router - You like living on the edge and just wanna play
Pros: Turn your black and blue paper weight back into a working wireless router.
Cons: I suppose you could make your WRT54G even deader than it already is, although I have not actually heard of anyone who has done this. The pictures in this tip are for people who have the v1.1 hardware. It works for the 1.0 and 2.0 versions as well but the board layout is a little different in the other hardware versions. You'll just have to find your flash chip.
Tools Required: Small jewelers screwdriver (or any other small pointy metal object).
Ok, I'm convinced, let's get this baby working!!
Let us begin:
NOTE: Click on the thumbnail images in this tip to zoom in on the image.
Find a nice open area to rip this baby apart:
WRT54G v1.1
As you can see, the one I use in my example is a v1.1 router, your board layout may be different:
WRT54G v1.1 - hardware version number
Use your fingers to unscrew the antennas from the back:
WRT54G v1.1 - unscrew antennas WRT54G v1.1 - unscrew antennas
This thing just snaps together, no screws involved, so just "pop" the blue face plate off. I find the easiest way to do this is to turn the unit upside down and place your hands between the feet on the side, then push on the blue feet with your thumbs:
WRT54G v1.1 - face plate snaps off WRT54G v1.1 - remove face plate
Now the board just slips right out the black cover:
WRT54G v1.1 - remove board from case
Now locate the flash chip. On my board it is clearly labeled "Intel Flash" but I don't believe all routers are labeled like this. Click on the pictures below for a better view. You will see that at each corner of the chip is a large white number. My picture is actually upside down (you didn't think I would make this easy on you did you?). Notice at the upper right corner of the chip is the number "1", upper left is the number "24", lower left is the number "25", lower right is the number "48" (all upside down in my pictures). Between the number 1 and 24 you will see a row of 24 silver pins. On the board above the pins there is a little white line every 5 pins that should help you count.
WRT54G v1.1 - Intel flash chip WRT54G v1.1 - notice white marks every 5 pins
Now comes the fun part. Do not plug the power in just yet but plug a patch cable into one of the 4 LAN ports on your router and plug the other end into a computer (my laptop works great for this). Configure your network card on your computer with a static IP address: IP: 192.168.1.2, NETMASK: 255.255.255.0, don't need a gateway address. Now if you are in Linux just type "ping 192.168.1.1" which will start a ping running. If you are in Windows (shame on you) then I think you have to pass a "-t" param (ping -t 192.168.1.1) so it doesn't stop trying to ping after 4 pings.
Ok, now for the nitty gritty fun part. Locate pin 15 (third white mark starting from pin 1). Take your jewelers screwdriver (philips head is what I used, nice and pointy) and touch the point between pins 15 and 16 (see NOTE1). While holding the screwdriver there, plug in the power and watch your ping screen. Hopefully you will be amazed (like I was) at seeing the pings starting to succeed. Don't be so happy that you drop the screwdriver on the board and start sparks flying. Remove the screwdriver and the pings should continue:
WRT54G v1.1 - short pins 15-16
The router is now in failsafe mode and is waiting on you to tftp a firmware image to it. Find any good firmware image for your router and upload it. In linux it might go something like this:
$ cd /home/voidmain/firmware $ ls OpenWrt_b3.bin $ tftp 192.168.1.1 tftp> bin tftp> put OpenWrt_b3.bin
If you have a command line version of tftp for Windows it should go pretty much the same way. Just make sure you transfer the file in binary mode (that's what the "bin" command did). Once the firmware has uploaded, your router should automatically reboot. If you uploaded the OpenWRT firmware like I did above you can then telnet into your box (telnet 192.168.1.1). If you uploaded the stock Linksys firmware you should be able to get to your router with your web browser (http://192.168.1.1/).
Now put your router back together by reversing the instructions in this tip. You are triumphant and there will be much rejoicing.
NOTE1: In my guestbook "Westy" said he had to short pins 16-17 rather than 15-16 on his WRT54G-FR but the rest of this document worked.
Further Reading: Linksys GPL Firmware page (Thank you Linksys and thank you Richard Stallman (GPL)!!) Original instructions at OpenWRT forums OpenWRT Web Site (my wireless web server runs it) My revival thread (Thanks Jim!) My wireless web server thread Jim Buzbee's Linux on WRT54G page Seattle Wireless WRT54G page French Version of This (Thanks m.! Forum Topic) P.S. SVEASOFT and Windows are not supported here.
Have fun!
