Apple has released iOS 4.3.4 and iOS 4.2.9 for iPhone 4 GSM/CDMA, iPhone 3GS, iPad 2, iPad 1, iPod Touch 3G and iPod Touch 4G. The main Reason behind this update to fix PDF Exploit and to block Untethered jailbreak on i-Devices. That means if you going to Downgrade iOS 4.3.4 to iOS 4.3.3, 4.3, [...]