OK, now I am going to tell you about a few firmwares that crash my linksys (luckily I have revived the router, thanks to the instructions posted at http://voidmain.is-a-geek.net/redhat/wrt54g_revival.html.
The working firmware on my router is Tarifa 0003. Unfortunately, I have never been able to make it as wireless bridge (WDS), eventhough I follow the instructions from the Internet (I guess it was at http://www.linksysinfo.org).
Anyway, after failing to flash the nvram with another firmware, I was able to recover my router which almost become a brick. 🙂