http://www.linksysinfo.org/modules.p...article&sid=36
That's the latest firmware I could find for your router. I don't know about 3rd party firmware, but that seems to be what Linksys is offering.
Be aware that you won't see huge gains from firmware tinkering. You'll be able to optimize everything and get a small increase in performance, but you don't get big benefits unless you modify the hardware. It's the nature of these things.
http://www.dslreports.com/forum/linksys
That's the Linksys forum over at dlsreports. They have a policy against linking to firmware so you won't find that there, but there may be some tips you can use. There certainly seemed to be a lot of threads regarding the WRK54G at a glance.
Good luck.
__________________
I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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