The Dev Team just released RedSn0w 0.9.5b5-5. This updated version of the popular jailbreak tool will fix the MMS and APN issues that many users encountered after jailbreaking their iPhone with RedSn0w.
According to the Dev Team, it’s safe to re-run RedSn0w 0.9.5b5-5 on an iPhone that was previously jailbroken with RedSn0w without restoring. Simply deselect “Install Cydia” if you do that.
Instructions to jailbreak your iPhone iOS 4 with RedSn0w remain the same. However, remember this is still a beta version. To date, this version of RedSn0w is only compatible with the iPhone 3G and iPod Touch 2G (non MC models). If you want to jailbreak the iPhone 3GS on iOS 4, you will have to use PwnageTool.
After jailbreaking your iPhone with either RedSn0w or PwnageTool, you can unlock it using the latest version of UltraSn0w.
You can download the latest version of RedSn0w from our iPhone downloads section.