Netgear WNDR4000

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[edit] Hardware Specs

CPU Broadcom BCM4718
CPU Speed 480 MHz
Flash ROM 8 MB
Radios 2.4 GHz and 5 GHz
WLAN Support a/b/g/n
WLAN Max Speed N750: 300 Mb/s (2.4Ghz)
450 Mb/s (5Ghz)
Antenna Location Internal
Switch 4x GbE + 1 GbE WAN
USB 1x USB 2.0

[edit] Flashing Instructions

It's always good practice to read the Peacock Thread for reference on Broadcom routers.

  • Flashing from OEM firmware requires the initial trailed build mini .chk file (with WNDR4000 in the name)
  • Upgrades use the nv64k dd-wrt build and NOT the nv60k nor generic builds.
  • Do not use a file without WNDR4000 or nv64k in the name to upgrade or you will brick the router.
  • Always verify all builds you plan on flashing are less than 7995392 bytes (7808 KB) in size or you will brick the router.

See Where do I download firmware? for links.

Go to the broadcom_K26 folder and download the K2.6_mini-WNDR4000.chk file first.

Installation procedure to flash from stock Netgear firmware to DD-WRT on a WNDR4000:

  1. Set a static IP such as: subnet: gateway: on the PC you will be using for the flash.
  2. Connect the PC to one of the router's LAN ports (unplug your ISP modem for the moment)
  3. Perform a reset on the router.
  4. In your web browser, go to
  5. Click on "Router Upgrade".
  6. Upload the special .chk firmware file, that you downloaded from the link above.
  7. Wait 5 minutes after the router says it is done, then perform another reset.
    • Recommended: clear the browser cache after updating firmware.
  8. Repeat steps 4-7 with the nv64k.bin firmware file.
  9. Set a strong password, then login and start tweaking
  • To use DHCP IP assignment, remember to unset the static IP set in the above instructions.

[edit] Build Information

As noted in bold in the flashing instructions, only use builds with nv64k in the name for upgrading, anything else will brick your router!

To find the latest builds, you can access the DD-WRT file server. You will need to look for the broadcom_K26 folder, in there should be the appropriate nv64k build in which you can use for upgrading.

Broadcom K3X builds (/broadcom_K3X folder, Linux kernel v3.10) are supported as well, refer to the K3X sticky and "New Build" threads.

See Where do I download firmware? for links.

To use mega builds, always verify they are less than 7995392 bytes (7808 KB) or it may brick the router.

[edit] Overclocking

The WNDR4000 CFE supports "overclocking" (the BCM4718 is rated for 533 MHz, but this model is underclocked to 480 MHz), though it is advised to add a heat sink or otherwise improve cooling or airflow. The DD-WRT GUI should be able to select between the original 480 MHz along with 500 and 533 options. The SoC references the pll20mhz_table from hndmips.c and can be manually set using the following:

  • nvram set clkfreq=480,240,120 (OEM speed)
  • nvram set clkfreq=500,250,125
  • nvram set clkfreq=530,265,132
  • nvram set clkfreq=533,266,133 (OEM speed of the E4200v1)

Verify this setting with `nvram get clkfreq` then run the following to apply:

  • nvram commit && reboot

Note: DD-WRT uses an 'overclocking' nvram parameter which can override the manual settings after boot. In this case, unset this parameter or change it to match your CPU speed (only the first setting, e.g. 533).

[edit] Unbricking

For more information: