WHR-HP-G300N
From DD-WRT Wiki
Initial Installation
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 the default is named "User Friendly" firmware
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