The official YouTube app has discontinued support for Android 5.0 (Lollipop) and 5.1. As of 2025, the YouTube app typically requires Android 8.0 or higher to function properly. Compatible Versions for Android 5.0+

Flash a tool like TWRP (Team Win Recovery Project).

While you can still enjoy YouTube on Android 5, you are largely confined to the browser version or third-party solutions. If the device is used frequently, considering a modern device or a custom ROM to upgrade to a newer Android version is highly recommended for security and stability.