firmware for fuji s2 pro

I have a couple fuji s2 pros and I'd like to use some 4gig compact flash
cards in them, but.... they won't recognize the 4gig. I'm wondering
ifthere's a firmware update that will allow this? I checked the fuji site,
and if there was one, they don't have it anymore, so if anyone has it, or
if they know another place to get one, I'd appreciate it. Or if anyone
knows how to make this work?

TIA

Paul.