Another update for iOS 4.3 was released to fix a critical security issue (certificate validation fix). A week earlier, iOS 4.3.4 was released wich fixed Mobile Safari vulnerability. If you have a untethered jailbroken device, you are advised to stay away from this update. Non-jailbreak iPhone, iPad, iPod touch users are strongly encouraged to download this update. You can do it by plugging your device into your computer, locating it in the iTunes sidebar and clicking on the “Check for Updates” option. The update should then immediately begin downloading and installing. Download iOS 4.3.5 for iPhone, iPad and iPod Touch.