14 DAY TRIAL // Today, August 4, 2016, Apple has introduced the fourth maintenance update to the iOS 9.3 stable series of mobile operating systems for iPhone, iPad, and iPod touch devices.
iOS 9.3.4 comes approximately two weeks after the debut of the third maintenance update, iOS 9.3.3, only to fix an important security issue that was used by the Pangu Team to jailbreak iPhone, iPad, and iPod touch devices running iOS 9.2 to iOS 9.3.3.
According to Apple, the security issue was, in fact, a memory corruption bug, which could have allowed an application to execute arbitrary code with kernel privileges. The iOS 9.3.4 update addresses the issue by improving the memory handling.
Please update your devices immediately, if they're not jailbroken
The iOS 9.3.4 is available as we speak for iPhone 4s and later, iPad 2 and later, as well as iPod touch (5th generation) and later. If you're running iOS 9.3.3, you should get a notification about a new software update.
To apply the update, open the Settings app, go to the General section, and press on the Software Update entry. Wait for the iOS 9.3.4 to appear, then press the Download and Install button, agree to the license terms and wait for the update to be installed.
As usual, the download and installation process will depend on your network bandwidth and device's specifications. During the update process, your device will be rebooted a couple of times, so don't panic because it's normal.
If you have a jailbroken iPhone, iPad or iPod touch device running iOS 9.3.3 from Team Pangu, then you should not update to iOS 9.3.4 because you'll lose the jailbreak. Most probably, it will take some time for Team Pangu to announce an iOS 9.3.4 jailbreak.