Buffalo, the american bison

Buffalo and DD-WRT collaborate
Buffalo WZR-HP-G300NH
Buffalo WHR-HP-G300N
Basic Features

• Wireless N
• 4 x 100mb/s ports
• AOSS
• DHCP
• Cable Router
• Atheros AR7240 rev 1.2 CPU (400MHz)
• 32MB Memory

Since the second half of 2010 the WHR-HP-G300N ships with a Buffalo supplied DD-WRT firmware installed by default. Older versions of the router are the same specifications and allow the DD-WRT firmware to be installed from the buffalo website/FTP server.
Buffalo refer to the DD-WRT firmware as the "Pro" firmware and the original firmware as the "User Friendly" firmware. Not to be confused but the "Pro" DD-WRT firmware is much more pleasing on the eye than the "User Friendly" firmware if not easier to use!

Initial Installation

Screenshot of WHR-HP-G300N Status Page

Buffalo now provide an official DD-WRT build direct from their own FTP site.
Acoring to Buffalo documentation the new DD-WRT firmware is installed by default on the WHR-HP-G300N however mine had the original firmware
The DD-WRT firmware is named as the "Pro" firmware and is installed by default. A "User Friendly" firmware is included as optional.
To download the firmware grab the zip file from ftp://whr-hp-g300n:whr-hp-g300n@83.244.133.35/
Extract the firmware from the zip and use the web based firmware upgrade interface as usual to upgrade to the "Pro" DD-WRT firmware from the stock "User Friendly" firmware

Firmware Versions

To find the latest community DD-WRT builds for this unit you would need to browse the FTP and look for the appropriate build for your unit. Below is the link for the file server.
ftp://ftp.dd-wrt.com/others/eko/BrainSlayer-V24-preSP2/
To find buffalo DD-WRT builds you would need to go to buffalo's support site and find the downloads section for your unit.
http://www.buffalotech.com/products/wireless/routers-and-access-points/
g300nh.blogspot.com/ software-installation-on-dd-wrt-part-1