The WHR-G125 is a 802.11g wireless router with a 5 port programmable ethernet switch.

OpenWrt should be installed via TFTP, follow the instructions in the HOWTO section. The correct image for this device is openwrt-brcm-2.4-squashfs.trx .

This device is supported by sysupgrade.

• Browse to http://192.168.1.1/cgi-bin/luci/mini/system/upgrade/ LuCI Upgrade URL
• Upload TRX file to LuCI
• Wait for reboot

• Login as root via SSH on 192.168.1.1
• Use the following commands to upgrade.

cd /tmp/
wget http://downloads.openwrt.org/latest/brcm-2.4/openwrt-brcm-2.4-squashfs.trx
sysupgrade openwrt-brcm-2.4-squashfs.trx

Note: This will void your warranty!

• Remove the Torx screw under the bottom label
• Gently tear off the bottom cover

Main PCB

Pin layout unknown yet

The board has an unpopulated 12-pin Broadcom style JTAG port (JP2).

nTRST 1 2 dead TDI 3 4 dead TDO 5 6 dead TMS 7 8 dead TCK 9 10 dead nSRST 11 12 GND

How to connect to JTAG interface, and how to reflash the device with JTAG tools

See port.jtag for more JTAG details.

The default network configuration is:

Numbers 0-3 are Ports 1-4 as labeled on the unit, number 4 is the Internet (WAN) on the unit, 5 is the internal connection to the router itself.

In OpenWrt versions up to Backfire 10.03, the first LAN port and WAN are reversed after flashing!

To fix the port assignment, apply the following configuration changes:

If you forgot your password, broken one of the startup scripts, firewalled yourself or corrupted the JFFS2 partition, you can get back in by using OpenWrt's failsafe mode.

• Unplug the router's power cord.
• Connect the router's LAN1 port directly to your PC.
• Configure your PC with a static IP address between 192.168.1.2 and 192.168.1.254. E. g. 192.168.1.2 (gateway and DNS is not required).
• Plug the power on and wait for the DMZ LED to light up.
• While the DMZ LED is on immediately press any button (Reset and Secure Easy Setup will work) a few times .
• If done right the DMZ LED will quickly flash 3 times every second.
• You should be able to telnet to the router at 192.168.1.1 now (no username and password)

NOTE: The root file system in failsafe mode is the SquashFS partition mounted in readonly mode. To switch to the normal writable root file system run mount_root and make any changes. Run mount_root now.

1. Forgot/lost your password and you like to set a new one: passwd
2. Forgot the routers IP address: uci -P/var/state get network.lan.ipaddr
3. You accidentally run 'opkg upgrade' or filled up the flash by installing to big packages (clean the JFFS2 partition and start over): mtd -r erase rootfs_data

If you are done with failsafe mode power cycle the router and boot in normal mode.

The Bufalo WHR-G125 has two buttons and one switch to toggle router and bridge mode when using the vendor firmware. These buttons can be used with hotplug events.

• CategoryModel 100MB Network with 4x1 ports