There are three main ways to get software onto your legacy device: 1. The "Last Compatible Version" Trick (No Jailbreak)
Tricking the app into thinking it is running on a newer iOS.
This is the safest method. If you have previously "purchased" an app on your Apple ID (even on a newer iPhone), it will appear in your tab on the iOS 9.3.5 device. Open the App Store and go to Purchased . Search for the app (e.g., YouTube or Instagram). Tap the Cloud icon . When prompted, select "Download Last Compatible Version" . 2. Using "Checkmate, Store!" (Jailbreak Required)
Unlocking Your Legacy Device: A Guide to Patched IPA Apps for iOS 9.3.5