Installing the 802.11G DD-WRT firmware:
1. Download latest DD-WRT firmware
http://dd-wrt.com/site/support/other-downloads
Select others >> eko >> BrainSlayer-V24-preSP2 >> pick a date (01-16-10-r13637 for instance)>> broadcom >> dd-wrt.v24_std_generic.bin
2. Install the firmware
Connect the router to your computer using an ethernet cable and go to 192.168.1.1 in your web browsers address bar
Under System Management select the Upgrade Firmware tab
Click browse and find your dd-wrt.v24_std_generic.bin file and click upgrade
3. Set the LAN mac address
After the router has rebooted go back to the 192.168.1.1 address in your web browser
Under Administration -> Commands tab run command:
nvram set et0macaddr=xx:xx:xx:xx:xx:xx
Where xx:xx:xx:xx:xx:xx is the LAN mac address on the bottom of your router