Can't go back from Tomato to Buffalo firmware on router

Hi!

First of all, thanks so much for the help. I went to that link and tried to follow the steps in it as closely as I could.

I got this far perfectly. It’s the part after that’s giving me a problem. I don’t know which TFTP script is being referred to or even what it is. The tutorial has this section -

But there is no such section on the provided link (even a Ctrl + F search yielded nothing).

I went on my own way and tried to use the TFTP feature (after enabling it, of course) in Windows 7 by going to Command Prompt and entering what this tutorial told me to (http://www.dd-wrt.com/wiki/index.php/Recover_from_a_Bad_Flash#Recovering_with_TFTP)

I got an “Access is Denied” message. I tried the DrayTek Router Tools but couldn’t understand how to use it. I found other simple GUI TFTP clients but even they couldn’t do anything.

Please, please help!