Apple dropped support for 32-bit devices years ago. YouTube regularly updates its API (Application Programming Interface). When an old app requests data using obsolete API protocols, Google’s servers return an error.
: Unofficial IPA files are not vetted by Apple's App Store. They can easily contain malicious code designed to steal Apple ID credentials, passwords, or personal data.
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If you have a device stuck on iOS 9.3.5 and want to watch YouTube, there are safer methods that do not require risking your digital security with sketchy IPA files.
If you do not want to jailbreak or use a patched IPA, you can use these more stable methods:
For years, the go-to solution for watching videos on these devices was downloading a modified YouTube IPA file or using a jailbreak tweak to bypass version checks. However, server-side changes by Google have patched many of these older workarounds.
Once you've installed the YouTube IPA for iOS 9.3.5 patched, you'll need to trust the app. Here's how:
Before installing the patched IPA, you need to prepare your computer and your iOS device. 1. Jailbreak Your Device
Running YouTube on iOS 9.3.5: The Ultimate Patched IPA Guide