WNDR4000 unbrick

Post new topic   Reply to topic    DD-WRT Forum Forum Index -> Broadcom SoC based Hardware
Goto page 1, 2  Next
Author Message
cswilsn
DD-WRT Novice


Joined: 28 Dec 2008
Posts: 4

PostPosted: Mon Jan 27, 2014 17:29    Post subject: WNDR4000 unbrick Reply with quote
Hello Everyone,

I have a Netgear WNDR4000 (N750) router running dd-wrt v24 build 21676 k2.6, while attempting to revert back to factory firmware something went funky.

I used what seems to be the preferred method of tftp'ing the factory firmware to the device, then waiting...and waiting...and waiting..nothing ever happened (about 45 minutes later) I tried resetting the router.

after several resets, and power ups/downs, and sitting and watching to see what happens...I only get 1 pin response from the router about 5 seconds after it powers up..then nothing.

Any help would be appreciated, I have been searching around for days for more information regarding recovery on this device with no success. I've tried various tftp methods time, and time again with no luck.

Thank you!
Sponsor
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7221
Location: Columbus, Ohio

PostPosted: Mon Jan 27, 2014 20:32    Post subject: Reply with quote
Peacock thread.
_________________
I am far from a guru, I'm barely a novice.
cswilsn
DD-WRT Novice


Joined: 28 Dec 2008
Posts: 4

PostPosted: Tue Jan 28, 2014 1:09    Post subject: ? Reply with quote
Malachi wrote:
Peacock thread.


I'm sure I have a brick, but probably should have asked if anyone has any clue where the jtag/serial port is on this thing? if there is one?

Probably just a malformed question.
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7221
Location: Columbus, Ohio

PostPosted: Tue Jan 28, 2014 1:13    Post subject: Reply with quote
Look here. http://www.dd-wrt.com/phpBB2/viewtopic.php?p=811071
_________________
I am far from a guru, I'm barely a novice.
cswilsn
DD-WRT Novice


Joined: 28 Dec 2008
Posts: 4

PostPosted: Tue Jan 28, 2014 2:47    Post subject: Reply with quote
Malachi wrote:
Look here. http://www.dd-wrt.com/phpBB2/viewtopic.php?p=811071


Thank you! Smile
SteveJenkins
DD-WRT User


Joined: 04 Dec 2012
Posts: 126
Location: Seattle, WA

PostPosted: Tue Jan 28, 2014 5:50    Post subject: Reply with quote
This, of course, is NOT the preferred way to do it.

It is, however, "a" way to do it:

http://stevejenkins.com/blog/2014/01/how-to-unbrick-a-netgear-wndr3400-n600-router-after-a-bad-dd-wrt-flash/

You'll need to find the right pins for your model, but I've done this a few times and (knock on wood) it's worked every time for me.

But if you have serial or JTAG ability, that's always preferable.

Let the flaming begin... Smile

_________________

My Max-Speed DD-WRT settings | K2.6 vs K3.x Speeds Head to Head | My Overclocking Settings | My blog: SteveJenkins.com | My Job: CheatCodes.com
Leeeeeo
DD-WRT Novice


Joined: 01 Apr 2012
Posts: 9

PostPosted: Fri Feb 14, 2014 1:28    Post subject: Reply with quote
Thanks to anyone that can send me the "pin short" method for WNDR4000. It's hard to find someone to create a serial cable for me.
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7221
Location: Columbus, Ohio

PostPosted: Fri Feb 14, 2014 1:43    Post subject: Reply with quote
Buy a serial cable. eBay has them for $2.
_________________
I am far from a guru, I'm barely a novice.
Leeeeeo
DD-WRT Novice


Joined: 01 Apr 2012
Posts: 9

PostPosted: Fri Feb 14, 2014 1:45    Post subject: Reply with quote
Thanks, Malachi. But I have no soldering skills! Sad
Leeeeeo
DD-WRT Novice


Joined: 01 Apr 2012
Posts: 9

PostPosted: Fri Feb 14, 2014 11:40    Post subject: Reply with quote
WNDR4000 does not have same board config, so I'm afraid to do wrong pin short... Sad
Blew
DD-WRT Novice


Joined: 18 Dec 2013
Posts: 11

PostPosted: Thu Feb 20, 2014 5:27    Post subject: Reply with quote
Leeeeeo wrote:
Thanks, Malachi. But I have no soldering skills! Sad


My WNDR4000 came with pins attached, so it required no soldering. Successfully debricked just using a TTL USB converter.
Leeeeeo
DD-WRT Novice


Joined: 01 Apr 2012
Posts: 9

PostPosted: Thu Feb 20, 2014 9:56    Post subject: Reply with quote
Blew wrote:
Leeeeeo wrote:
Thanks, Malachi. But I have no soldering skills! Sad


My WNDR4000 came with pins attached, so it required no soldering. Successfully debricked just using a TTL USB converter.


Can you please post a photo of these pins?
Blew
DD-WRT Novice


Joined: 18 Dec 2013
Posts: 11

PostPosted: Thu Feb 20, 2014 10:15    Post subject: Reply with quote
Leeeeeo wrote:

Can you please post a photo of these pins?


I didn't take a photo, but it looks exactly like this one:
http://static1.wikia.nocookie.net/__cb20110401182441/infodepot/images/9/94/Netgear_WNDR4000_d.jpg

See the vertical row of 6 pins just above the heatsink in the middle of the board?
linuxjunky
DD-WRT Novice


Joined: 07 Feb 2013
Posts: 1

PostPosted: Sat Feb 22, 2014 8:58    Post subject: Reply with quote
Mine Bricked yesterday, so i tried to shorten the pins with a Screwdriver.
As you can see in the Picture,looks like i've found em.

I can give no guarantee that it works for you!

Power the Router on and shorten them for a few seconds or until the Powerled is blinking green (you have to be fast after power on).
Now you should have access via tftp and you can ping the router.


It's curious. every release i've tried after 21676 ends up in a softbrick....i don't know why (trailed build or 64k build doesn't matter; tried Brainslayers builds and fractals builds)
I have flashed many homerouters to dd-wrt but that never happened before.



Netgear_WNDR4000_d1.jpg
 Description:
 Filesize:  472.26 KB
 Viewed:  17375 Time(s)

Netgear_WNDR4000_d1.jpg


Leeeeeo
DD-WRT Novice


Joined: 01 Apr 2012
Posts: 9

PostPosted: Sat Feb 22, 2014 19:37    Post subject: Reply with quote
Blew wrote:
Leeeeeo wrote:

Can you please post a photo of these pins?


I didn't take a photo, but it looks exactly like this one:
http://static1.wikia.nocookie.net/__cb20110401182441/infodepot/images/9/94/Netgear_WNDR4000_d.jpg

See the vertical row of 6 pins just above the heatsink in the middle of the board?


Unfortunately, my board has different configuration. See picture...



wndr4000.jpg
 Description:
 Filesize:  64 KB
 Viewed:  17336 Time(s)

wndr4000.jpg


Goto page 1, 2  Next Display posts from previous:    Page 1 of 2
Post new topic   Reply to topic    DD-WRT Forum Forum Index -> Broadcom SoC based Hardware All times are GMT

Navigation

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum