Netgear WNDR3400

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[edit] Important Notes

Only version 1 is supported. Versions 2 & 3 are not yet supported.

Use only K2.6 builds with nv64k in the name.

dd-wrt.v24-21676_NEWD-2_K2.6_mini-nv64k (and big) appear to be the latest build with working wireless.

Please note build size limits listed in peacock annnouncement. Some Mega builds might be too big

Recently (2014/05/31) tried flashing beyond this, to builds like dd-wrt.v24-24160_NEWD-2_K3.x_mega-WNDR3400.chk and dd-wrt.v24-23838_NEWD-2_K3.x_mega-nv64k.bin and met with failure (brick, had to pin-reset). So these instructions are current!

Read Peacock topic (at top of Broadcom Forum). Read it all. Carefully.


[edit] Hardware Specs

CPU Broadcom BCM4718A1
CPU Speed 480 MHz
Flash ROM 8 MB
RAM 64 MB
Radios 2.4 GHz and 5 GHz
WLAN Support a/b/g/n
WLAN Max Speed 300 mbps on 2.4Ghz and 300mbps on 5Ghz
Antenna Location Internal
Switch 4x 100 LAN + 1x 100 WAN
USB 1x USB 2.0


[edit] DD-WRT Installation

  1. There are two versions of this router with corresponding initial flash mini firmware. One is for Netgear branded routers and the other is for Cablevision routers.
  2. Do a factory reset (recessed button in the back), and upgrade with the appropriate mini firmware above. If it complains about downgrading, just Allow.
  3. To gain functionality of the usb port, upgrade to the big version or the mega version after flashing the mini version above.
  4. 30-30-30 reset router (as described in Peacock).


[edit] Build Notes

[edit] 19342

  • Big and Mega contain the Heartbleed vulnerability!
    Use only Mini version of this build!
  • This is otherwise a good build for this router.

[edit] 21676

  • Upgrading to Big will brick this router!
    Mega contains the Heartbleed vulnerability!
    Use only Mini version of this build!
  • This is otherwise a very good build for this router.

[edit] Kong 22000++

  • DLNA
  • VPN
  • Recommended build for this router.

Gostmn26

I had installed 22000++ build from the old KONG download sight, it kept dropping the 5ghz wireless signal. The new downloads for KONG 22000+ or 22000++ have all bricked my router. Previously on the old download sight all the VPN downloads would brick my router. My experience with kong builds for this router the 22000 from the old download sight was the best for stability on wireless signal. There is one problem I am having with the 22000 DLNA version I have installed no from the new download sight, the USB shows on the gui page that it's mounted to /opt. When I ssh into router the drive doesn't show up as mounted and therefore "optware" isn't loaded.

[edit] Unbricking

This router can be "bricked" (rendered inoperable) by flashing the wrong firmware; by not following the correct flashing procedure (in Peacock); or by flashing a bad build like 21676 Big.

[edit] Factory method

See Reinstall the firmware on a router without the setup CD recovery tool

[edit] Recovery mode method

This method, which works on the WNDR3800, may also work on the WNDR3400v1.


I tried the recovery method listed for WNDR3800 and couldn't seem to get it to work, it could be the timing. I was trying with linux TFTP and it does try around ten times and started it before and just after starting it but still didn't work.

What does work is a serial recovery, with serial adapter attached here is what worked.

  • Hit CTRL-C then start router
  • Type TFTPD at CFE prompt to start TFTP server
    • Could not get firmware to flash from CFE prompt
  • TFTP either the official netgear firmware or DD-WRT initial flash firmware.
    • Had to use firmware with ".chk" extension, DD-WRT firmware with ".bin" extensions would flash, however, it would stop there and router will not program.
  • Afterwards you can then upgrade to mega or Kong builds.

Gostmn26 15:16, 23 November 2014 (CET)

[edit] Pin short method

If you have bricked your router, and you are willing to accept the risk of damaging it beyond repair (as warned in Peacock), the router can often be recovered by shorting pins as described here.

  • Timing of the pin shorting is tricky -- power on, wait for the lights to flash, then try shorting a few times until the power light starts flashing steadily.
  • Next use tftp2 (with no password) to flash factory firmware.
  • After the flash, wait at least five minutes after the router boots up and the power light becomes steady green before resetting the router.

Here is another overview of the process for the WNDR3400 http://stevejenkins.com/blog/2014/01/how-to-unbrick-a-netgear-wndr3400-n600-router-after-a-bad-dd-wrt-flash


[edit] Revert to Factory Firmware

  1. Download official Netgear firmware
  2. Reset DD-WRT (recessed button in the back)
  3. Enable telnet under services
  4. Telnet to router (192.168.1.1)
  5. Issue the command "mtd erase linux" & wait ~3 mins
  6. tftp the official firmware to the router
    • tftp for windows [1] enter router ip, leave password blank, select official firmware file
  7. 30-30-30 reset router (as described in Peacock)