Both of these tools actually create custom firmware which does not upgrade your baseband.
If you are not interested in *****ng these custom firmware [ipsw] and just want to restore it straight away for jailbreak, we have created these custom iOS 4 firmware [ipsw] for iPhone 3GS and 3G using PwnageTool 4.0/4.01. These custom firmware are different for unlockers [Unofficial Carriers] and official carrier users. Download the one according to your requirements and follow official PwnageTool 4.0 instructions.
Download Custom iOS 4 Firmware for iPhone 3GS
3GS Custom iOS 4.0 Firmware - (For Unlockers)] [iBooks Fix]
3GS Custom iOS 4.0 Firmware - (iBooks Fix)
Download Custom iOS 4 Firmware for iPhone 3G
3G Custom iOS 4.0 Firmware - (iBooks Fix)
3G Custom iOS 4.0 Firmware - (iBooks Fix)
Here's Some Tested Unlock iPhone 3Gs 4.0 Without Upgrade Baseband
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