Apple released iOS 8.1 operating system last month, introduced the function of supporting Apple Pay mobile payment service for iPhone 6 and iPhone 6 Plus, and launched a public beta version of iCloud Photo Library.

Apple has officially launched the iOS 8.1.1 upgrade patch for the iOS 8.1 operating system released last month for iPhone, iPad and iPod Touch. Previously, the company released a beta version of this upgrade patch to members of its developer program.

Apple said iOS 8.1.1 will improve the performance of older devices based on iOS 8 and using A5 chips, that is, iPad 2 and iPhone 4S. The iPod Touch, which Apple is currently selling, was launched in 2012 and is also equipped with the A5 chip developed by the company. On the surface, this upgrade patch does not seem to be different from the iOS 8.0.1 system that failed when it was released.

Apple's latest iOS 8.1.1 fixes Pangu's jailbreak. The good news is that Apple has not closed the verification of iOS 8.1 until the deadline. This means that you can also upgrade your device to iOS 8.1 and jailbreak it.

Users can upgrade via wireless mode. When upgrading, they need to use the WiFi network and ensure 50% or more of the power or connect to the power supply for downloading and installing updates.