[Noisebridge-discuss] Bricked Router

Casey Callendrello c1 at caseyc.net
Tue Jan 18 15:02:55 PST 2011


Before you go JTAG crazy, you might have an easier option, which has
saved me in the past. On booting, the WRT54G will wait 1 second on the
most recently configured IP address for a TFTP PUT. On getting one, it
will accept a TFTP transfer and load it in to firmware. If it doesn't
receive one, it will attempt to boot via the traditional method. I've
successfully de-bricked a router twice using this option.

There is a more formal wiki introduction here:
http://oldwiki.openwrt.org/OpenWrtDocs%282f%29Installing%282f%29TFTP.html,
but all you need to do is (on a linux and macos box)

1) Hardcode your wired interface to something like 192.168.1.2/24

2) Type the following

tftp 192.168.1.1
binary
rexmt 1
timeout 60
trace

3) Type this command but don't hit enter
tftp> put $FILENAME.bin

Hit enter and power up the router at about the same time; tftp will
constantly re-try.  It might take a few tries to win the race, so don't
get discouraged. I highly suggest using the vanilla Linksys firmware for
this :-).

Best of luck!

--Casey

On 01/18/2011 11:30 AM, Robert Fletcher wrote:
> Hey All,
>
> So I was trying to install DD-WRT on our router and managed to brick
> it.  This wasn't entirely unexpected as it was pretty much a last
> resort to try and get it working before buying a new one, which I
> did.  But I thought if anybody knew how to unbrick it I would love to
> learn.  From my cursory readings online it apparently requires opening
> it and doing something related to the acronym JTAG, but that's where
> things start to get fuzzy for me.  Does anybody have any experience
> with this and is willing to teach me?  It's a Linksys WRT54G.
>
> Thanks,
> Robert
>
>
> _______________________________________________
> Noisebridge-discuss mailing list
> Noisebridge-discuss at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss

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