Downgrading firmware on WRT54G/access restrictions

I had a WRT54G.  Access restrictions worked.  I upgraded the firmware and the access restrictions no longer worked. 
So after researching, it appears the firmware I upgraded to was buggy and the access restrictions didn't work with the new firmware.  I couldn't figure out how to downgrade back to what I had. 
Called Linksys and ultimately they said they would send a new router.  I asked if it would have the old firmware that my router had previously, where the access restrictions worked.  Yes, they said.
New router arrives today.  Firmware is v1.02.2, June 7, 2007.  NOT the prior firmware.  Sure enough, the access restrictions still do not work on this router either.  I don't want to spend yet another two weeks trying to resolve this with Linksys.
Question:  Is there a way to downgrade to firmware where the access restrictions actually work for WRT54G?  If so,
what version should I downgrade to?
where do I obtain it? and
can I download the firmware and then install it using the administration/upgrade firmware tab on the router (even though it is a downgrade)?
Thanks very much for any thoughts.

Thanks for the suggestion, Badboy.  Unfortunately, although I could download the firmware and successfully load it onto the router, the access restrictions in that version do not work either.
It doesn't seem as though all prior versions of firmware are on the ftp site, ftp.linksys.com.  For example, I also have a wrt54gs v. 4 (speedbooster) with the same access restriction problem.  It currently has a firmware version loaded that doesn't appear to be listed on that website.  (I couldn't download prior firmware for that version that worked.)  So, perhaps prior firmware exists for the wrt54g v. 6 that is not listed on that site also.
Does anyone know if there is another site that has a more extensive collection of prior linksys firmware? 
If not, I suppose I can call linksys again, but even if they send yet another router promising the old firmware on it, I suspect the message is just going to get lost between the promise made on the phone and the guy in the warehouse filling the RMA order.

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