The iPhone Dev-Team has just released Redsn0w 0.9.6RC9 to jailbreak iOS 4.3.1 untethered on Windows and Mac. Moments earlier, Pwnagetool 4.3 for iOS 4.3.1 untethered jailbreak was also released.
Redsn0w 0.9.6RC9 will jailbreak iOS 4.3.1 untethered on your iPhone 3GS/iPhone 4, iPod touch 3G/4G, iPad 1 and second-generation Apple TV on iOS 4.2.1. The iPad 2 is not vulnerable to this exploit.
For unlockers:
WARNING WARNING — ultrasn0w users don’t update yet! We need to first release an update to ultrasn0w that fixes some incompatibilities when FW 4.3.1 is used on the older basebands supported by ultrasn0w. And remember once we do fix ultrasn0w for 4.3.1 (we’ll announce it here and on twitter), you must only get there via a custom IPSW from PwnageTool, Sn0wbreeze or xpwn! Don’t ever try to restore or update to a stock IPSW, or you’ll lose the unlock!
Download Redsn0w 0.9.6RC9 for Windows and Mac
Download Redsn0w 0.9.6RC9 for Windows
Download Redsn0w 0.9.6 RC9 for Mac
Download iOS 4.3.1 for iPhone, iPad and iPod touch