Wi‑Fi‑only models can update to iOS 9.3.5, while cellular models may receive iOS 9.3.6 (a minor update that fixes GPS functionality).
IPA Apps for iOS 9.3.5: Breathing New Life into Legacy Devices (2026 Guide) Ipa Apps Ios 9.3.5
This is the easiest method if you don't have a computer handy. Wi‑Fi‑only models can update to iOS 9
An IPA (iOS AppStore Package) is essentially the raw file format for iOS applications, similar to an .exe file on Windows or an .apk file on Android. iPhone 5 (GSM)
iPhone 4s, iPhone 5 (GSM), iPhone 5c (GSM), iPad 2, iPad 3rd generation, iPad 4th generation, iPad Mini 1st generation, iPod Touch 5th generation.