The final operating system version compatible with the second-generation iPad is iOS 9.3.5 (for Wi-Fi models) or iOS 9.3.6 (for cellular models). This represents the upper limit of software support for this particular hardware. Subsequent iOS iterations are not available for installation due to hardware limitations.
This software version is significant because it provides the last security updates and feature sets Apple deemed compatible with the device’s processor and memory capabilities. Understanding this constraint helps manage expectations regarding app compatibility and overall device performance. The iPad 2, despite its age, remains functional for basic tasks; however, its utility is limited by the outdated operating system, as newer apps often require later iOS versions.