WHR2-A54G54

The Buffalo WHR2-A54G54 router has 54mbps WiFi, 4 100mbps ETH-ports and 0 USB-ports. It also supports custom firmwares like: dd-wrt

Quick links:
Default password/Login
Flashing Custom Firmwares

WHR2-A54G54 router specifications (specs)

System specs
CPU: n/a
RAM: 64 MiB
Flash: 4 MiB
Custom firmwares: dd-wrt

Connectivity
WiFi: 54mbps (abg)
WiFi bands: n/a
WiFi throughput: n/a
WAN: 1 x 100mbps port
ETH: 4 x 100mbps ports
USB-ports: 0

Hard reset instructions for Buffalo WHR2-A54G54

If your WHR2-A54G54 router is not working as it should, dropping connections or not being responsive, you should first do a reset of the router to see if the problems persist. Other scenarios where you might want to reset your router is if you've forgotten the password or misconfigured it and can't get access anymore.
Your can reset your Buffalo WHR2-A54G54 in the following way(s):

The 30-30-30 reset

There are no specific instructions for this model yet, but you can always do the 30-30-30 reset as follows:

When router is powered on, press the reset button and hold for 30 seconds. (Use a paper clip or something sharp)
While holding the reset button pressed, unplug the power of the router and hold the reset button for 30 seconds
While still holding the reset button down, turn on the power to the unit again and hold for another 30 seconds.

This process usually works for resetting any router to it's factory setting.

Note: It is worth reading more about how to reset routers with the 30 30 30 reset and what the risks and considerations are when resetting your router this way, instead of just rebooting it.

Default factory settings for Buffalo WHR2-A54G54

If you have performed a reset of your WHR2-A54G54 device or not changed the defaults, you should be able to access it with the following settings:

Default subnet mask: 255.255.255.0

Note: If you are using the default settings you should change them to increase security and prevent unathorized access to your network.

WHR2-A54G54 Firmwares

Staying up to date with the latest firmware is a good idea to keep your router even more secure from various security flaws.
If you want to squeeze a little bit of extra functionality out of your router, consider flashing an open-source firmware like dd-wrt, openWRT or LEDE. Flashing a custom ROM can greatly increase the stability and functionality of your old router.
Following are the firmwares that we have identified existing for the Buffalo WHR2-A54G54:

Flashing dd-wrt on the Buffalo WHR2-A54G54

Since the WHR2-A54G54 has 4 MiB of flash memory, you should choose a stripped down version of dd-wrt that fits on the smaller flash. We haven't find any specific instructions for flashin dd-wrt onto the Buffalo WHR2-A54G54, but you can read the Installation guide over at dd-wrt to get a clue on how to proceed (As this model is listed as supported).
Note: Always make sure to read the wiki and howtos of dd-wrt before doing any flashing.