Where to find old EFI Bootroms for Macbook Pro?

i did lion upgrade, , boot camp/ windows 7 partition stopped working. reinstalled os snow leopard, , tried reinstall boot camp no success. thing can think of lion update updated efi boot rom , reason, there black, blank screen when trying install windows 7 or xp.

want try downgrading efi see if fixes problem. however, can find older bootroms? i'm using efi 1.7 on 5,3 mbp , find original bootrom machine came with.

suggestions welcomed.

thanks.

 

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