iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
Apple Releases iOS 4.3.4 to Address Latest Jailbreaking Vulnerability
The iOS 4.3.4 update comes in as Build 8K2, while the iOS 4.2.9 registers as Build 8E501.
iOS 4.3.4 Software UpdateApple has also posted security-related documents outlining the three vulnerabilities patched in iOS 4.3.4 and iOS 4.2.9.
Fixes security vulnerability associated with viewing malicious PDF files.