How do I downgrade iPhone 4.0.2 iOS to 4.0?

NAS

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Ive downloaded the 4.0.2 software for my iPhone like alot of ppl have and found out it cant be jail broken with this. I tried restoring it at first and now im needing to know if restoring it deletes the SHSH blobs Cydia ? cause ive tried several ways of both downgradin and tryin to jailbreak it with redsn0w_win_09.5b5-5 software but nothings working.
I have a 3Gs and i have done the thing on saurik. and nothin still seems to be working
and i try with DFU mode but it keeps saying error 3002
i have jail broken it in the past. thats the only way i could use it as a phone. and the Cydia SHSH blobs have been deleted from it and redsn0w does work but only on 3G and non MC 2G models
 
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