How to install a update for a boot rom firmware On a intel iMac mid 2011?

I HAVE A INTEL IMAC  2.5 GHz Intel Core i5 4 G RAM MID 2011  21,5 inches, SOFTWARE VERSION  OS X 10.8.3 (12D78),  Boot ROM Version:          IM121.0047.B1F I try to use boot camp to install windos 8 nad get this dialog box notification:
Boot Camp Assistant cannot be used.You must update your computer's Boot ROM firmware before using this setup assistant.
I run updates from software uupdate but my suystem was full updated,  dowload the firmare manually, but could not install it ( boot camp 5, also try to instll firmware manully and install and run the .exe but did install .) I will appreciate any help.
Miguelangel2000

Welcome to Apple Support Communities
As you can check in this website, you are running the most recent EFI and SMC version available for your computer. In this case, reset the SMC and the PRAM, and finally, try to use Boot Camp Assistant

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