Wait, how are you trying to SBF? Are you trying to flash it like a ROM straight from your phone? This needs to be done using RSDlite on a PC, and you need the SBF for your phone model. It doesnt really matter what version it is.
There are quite a few how-to's for SBFing that have specific step by step instructions
Sent from a long time ago in a galaxy far far away, from my hTc Thunderbolt
post back after you download it.