iH8sn0w wrote this today --> HERE
**BEFORE PROCEEDING, ENSURE THAT YOU HAVE YOUR PHONE BACKED UP!**
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WHAT YOU WILL NEED:
* An iPhone 3G[S] -- new bootrom
* 3.1.2 SHSH blobs.
* difrnt's iBSS grabber
* Payload Pwner-r2 for the 3GS.
* sn0wbreeze V1.6.2
* iBooty
* LibUSB (64-Bit users read carefully!!!)
* 3.1.2/4.0 3GS firmware downloaded.
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Please read the rest --> HERE.