I think you may be confusing a bootstrapper with an SBF file. You use a program called RSD Lite to use an SBF file to flash your phone back to the exact way it came from the factory. You just use the bootstrapper to backup the system you're currently using and load custom ROMs, ect. I believe if you want the D2G SBF you still need to buy the Team Blackhat app from the market and download from them.
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