Motorola WR850G

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This tutorial has been updated and edited to reflect the latest 23Rev2 version. The installation method may be different if you're attempting to install a previous version. This tutorial has been updated and edited to reflect the latest 23Rev2 version. The installation method may be different if you're attempting to install a previous version.

Revision as of 23:48, 2 October 2006

This tutorial has been updated and edited to reflect the latest 23Rev2 version. The installation method may be different if you're attempting to install a previous version.

The Motorola WR850G is based on very similar hardware to the Linksys WRT54G except that it stores the MAC address information in flash memory and, in version 3 (the latest version), it has antennas that are not removeable (one antenna is internal). The way it stores the MAC address requires a special "mini" firmware first to use DD-WRT firmware. Versions 1 and 2 have removeable antennas but the firmware doesn't work equally well between those two versions.

The version can be easily identified by looking at the bottom of the Router. It should be listed under the FCC ID ending as V2 or V1.

The following instructions will only work with hardware versions v2 and v3 or the WR850G and the WR850GP. If your WR850G doesn't have any version information on the back, it requires different instructions.

Even though DD-WRT v23 SP1 and later knows about the hardware it is being installed on, you risk bricking the router when restoring defaults!



Below are listed two methods. Try the first, as the second seems to be slightly more difficult, and possibly buggier.

Normal Method

Flashing the Motorola WR850G is a multi-step process to get to the full version or a single step if the mini firmware's options are sufficient. Remember to use a wired (ethernet) connection when flashing firmware. That means make sure your computer is hooked directly via a cable, and not via WiFi.

In the original configuration by Motorola, the MAC address information for the Motorola WR850G is not stored in the same manner as the other routers, so a special "mini" version is necessary to convert the router to work with the full version of DD-WRT. This mini version has many of the features of the full version and may be sufficient for most users.

This method has been tested with Motorola firmware version 6.14. It is strongly recommended you upgrade your Motorola firmware to this version prior to starting.

  1. Download the motorola-specific firmware from *ATTENTION - These links are out of date. Please go to the main index, choose downloads, and select the the Motorola Mini, not the micro version.DD-WRT. The Motorola specific router is dd-wrt.v23_mini_moto.bin.
  2. If you want the full version or a specialized full version of the firmware, download the generic version of the full version from DD-WRT. You can download the zip file (which contains more files than you require), or you can download the standard generic one (with more features) or a specialized one (such as the VOIP version) from one of the directories. Unzip if you use the zip file.
  3. Logon the the Motorola Router's Web Interface.
    • The router's default IP address is "" If this address is not found, make sure your network card's settings are set to automatically detecting DHCP.
    • The router's default username is "admin"
    • The router's default default password is "motorola".
  4. On the firmware upgrade page (the last tab), upload the motorola-specific mini firmware. This will take several minutes to transfer the file and then several more minutes until the router reboots completely.
    • If your router informs you that upgrade firmware failed try changing the moto mini file extension from ".bin" to ".trx". This probably won't be necessary.
  5. Now login to the Web Interface of your DD-WRT router
    • The ip is now, older versions may preserve the ip.
    • The username is root.
    • The password should be "admin" but may be your old password.
  6. Reset the router to Factory Defaults.
    • Your router's IP Address may now be "".
    • You may need to renew your DHCP license.
    • The password will now be "admin"
  7. Change settings as you like or upgrade to a different version of DD-WRT. The Motorola V2 has 16MB of memory, so you can safely upgrade to any firmware you like. Voip has been confirmed as running fine.
    • Be sure to use Generic Versions of DD-WRT files.
    • Some things you might want to do:
      • Ensure firewall is on (security)
      • Change Wireless SSID
      • Add Wireless Security

Alternate method

If the method above failed, you may find yourself with a bricked router. All is not lost!

The router can be recovered just like the Linksys Router. The motorola router uses an IP address of instead of the Linksys

The starting conditions for this are that the router is unplugged (no power).

NOTE: Some computers with wired and wireless connections may not work as intended. You may need to use a computer with only one ethernet connection to router to work as intended.


The Least intrusive method is to try to "tftp" the firmware to the router.

  1. Set a static IP address to your computer's ethernet port. Set your IP address to something in the same subnet, specifically 192.168.10.x ( is recommended). Set the subnet to and the gateway to Ignore any DNS settings.
  2. Plug the ethernet cord into the router and computer, if not already connected.
  3. Open up two command shells (in windows, run "cmd"). On one shell, run a continuous ping of (the router) by running "ping -t". Initially the ping will not reach the router; this is normal.
  4. In the other shell, type in (but do not run) "tftp -i put (path\firmwarename.bin)" (where "(path\firmwarename.bin)" is the path and filename of the mini firmware specific to the motorola router.)
  5. Plug in your router to give it power, but only after understanding the following:
    • You have a time constraint upon powering up your router. Once you powered, You will need to be able to do the following step quickly as it is time driven.
  6. Wait for the ping command to start recieving replies and run the tftp command you entered before ASAP.
  7. If successful, a delay should occur and then report that a xxx bytes transferred.
    • The router will then store that firmware and start using the firmware.
    • This will take several minutes!
    • You can tell the router is finished after the red power light changes back to green (stays green for more than 15 seconds).
    • After the router is running again, you'll need to set your computer to obtain an IP address automatically. You'll think the router isn't working when your computer is now just using a different subnet.