You use RSD Lite 4.9 to SBF your phone with the .340 SBF file...when you are done with the SBF process, then you factory reset it(holding power and home, then pressing search, then selecting wipe data and wiping cache). That's all part of the process. You can't just SBF your phone. You always do a factory reset afterwards, then you'll be on stock 2.2.1

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