Even with a patched IPA, YouTube’s server-side checks are aggressive. Google frequently deprecates legacy API versions. A modified client may work for days or weeks, but then suddenly fails to load videos or comments. Moreover, features like Google account sign-in rely on modern OAuth and WebView components missing in iOS 9.3.5. Users often report success initially but frustration later.
To fix the YouTube app on iOS 9.3.5, you can either download the last compatible version from your "Purchased" history or use a jailbreak method to "spoof" the app version to bypass update prompts. download youtube ipa file for ios 935 fix