Have you fix you problem router and xbox live

you can? well i have a linksys wrt54g version 3.0 and i recently did a firmware upgrade from hyper wrt back to the original software and it completely screwed it up im unable to reload the new firmware dd-wrt thru tftp or any other method aside from a jtag cable and i dont have one any ideas? the tftp seems like it would work i can ping the router and get a responce but when i try ftp it tells me the router isnt responding