How to TFTP
http://www.dd-wrt.com/wiki/index.php/TFTP_flash


Setup a static ip on your pc.
Windows Vista
Go to Start
Control Panel
Network And Internet
Network and Sharing Center
Manage network connections
Right click on Local Area Connection
Double click on (Internet Protocol Version 4)
Select use the following Ip address
IP address: 192.168.1.10
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
Click OK.


server:   192.168.1.1
password: admin (Or leave blank)
File:    browse for the .BIN file
click on upgrade button and it should now start the upgrade
let it sit for a few minutes
once successful, hard reset and reconfigure router
Router should now be debrick repair.

Now go back and select Obtain an IP address automatically from were when you setup a static ip on your PC.