I did not do that at all, I assume you mean from stock recovery, and reason being I have never had an issue with 602 sbf, I do however do it before sbf
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try doing it from stock recovery after the SBF and tell me if it fixes your problems
out of curiosity I did an SBF to Froyo on my phone to see if I would have the same issues, it went fine but I did the data/cache/dalvik wipe after the SBF