Motorola WR850G v3.0
Motorola WR850Ga






WR850G v3.0






Not Supported



Your here: Home / Network / Hardware Specific / Motorola / WR850G v3.0

NOTE: During configuration or flashing a device, the only that should be hooked to the device is the computer and power.


Fixme This section is in need of cleanup!


Serial Num. = ?
CPU Type = Broadcom BCM4712
MIPS Rev = ?
CPU Speed = 200MHz
Bus = ?
Flash Type = ?
Flash Chip = ?
Flash Size = 4MB
Max Firmware Size = ?
RAM Size = 16MB
RAM Chip = ?
nvram Size = ?
Switch = ?
Port-based vlan = ?
802.1q vlan = ?
Ethernet Port Count = 1-WAN 4-LAN
Wired Standard = IEEE 802.3?
boot_wait = ?
bootloader = ?
Flash Card Socket/Type = ?
SD/MMC Mod Support = ?
MiniPCI slots = ?
PoE = ?
Power = 12V/0.5A
Color of LEDs = ?
Size = ?
USB = ?
Serial Port = ?
JTAG Port = ?
Supported by TJTAG/Version = ?
Supported by dd-wrt as of = v24
dd-wrt K2.4 Support = ?
dd-wrt K2.6 Support = ?
Special Features = ?

Radio (wl0)

Wireless Radio = Broadcom
WLAN DSP processor = ?
Antenna Connector Type = ?
Wireless Standard = IEEE 802.11b/g
WiFi Operating Frequency = ?
 802.11g = 6, 9, 12, 18, 24, 36, 48, 54Mbps
 802.11b = 1, 2, 5.5, 11Mbps
Radio cor_rev = ?
Radio Capabilities = ?

Links of InterestEdit

Fixme This section is in need of cleanup!



Because this tutorial reflects the latest 23SP2 version the installation method may be different if you're attempting to install on a previous distribution.

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!

It is extremely important to follow the guidelines for your specific modem. Please see Installation for more information. Remember to follow the peacock thread first for background [1], use this page to identify your modem model correctly, and use the dd-wrt download search page (DD-WRT Downloads page or secure version) to ensure that you are getting the correct file (or files, as often is required) for the job.


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

Normal MethodEdit

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. NOTE: For the Motorola WE800G, the default IP is "".
    • 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 4MB of flash memory (and 16MB RAM), 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 MethodEdit

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

NOTE: For the Motorola WE800G, the default IP is "".

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.


Fixme This section is in need of cleanup!


Fixme This section is in need of cleanup!

JTAG/Serial InfoEdit


JTAG PinoutsEdit
Fixme This section is in need of cleanup!
JTAG RecoveryEdit
Fixme This section is in need JTAG Recovery Instructions!


Serial PinoutsEdit
Fixme This section is in need of cleanup!
Hyper terminal Setup in Windows XPEdit
In Windows XP, Click Start Button - All Programs - Accessories - 
   Communication - HyperTerminal
Enter a name for the connection, Click ok
Choose com port you adapter is plugged into, Click ok
 Bits per second = 115200
 Data Bits = 8
 Parity = none
 Stop bits = 1
 Flow control = none
Click ok
Click File - Save As, and select a place to save it to so you 
             don't have to enter the settings again.
Putty Setup in Windows XPEdit
After installing putty, run it
 Serial line = The COM port your using for serial (ie. COM3)
 Speed = 115200
Click on Serial under Connection
 Serial line to connect to = same as above (Serial line)
 Speed (baud) = 115200
 Data bits = 8
 Stop bits = 1
 Parity = None
 Flow control = None
Click Session
 Enter a name for your connection under saved sessions
Click Save
Click Open
Serial RecoveryEdit
Fixme This section is in need of Serial Recovery Instructions!

USB InfoEdit

Fixme This section is in need of cleanup!

vlan InfoEdit

Fixme This section is in need of cleanup!


Fixme This section is in need of cleanup!

FCC PicturesEdit

Fixme This section is in need of cleanup!


Hardware ModificationEdit

Community content is available under CC-BY-SA unless otherwise noted.