Android 5.1 (API level 22) was released in 2015. Many devices stuck on this version no longer receive official system updates from manufacturers. As a result:
If you're running Android 5.1 on your device, you'll need a compatible version of Google Services APK. The version you need might depend on your device and region.
The Google Services APK is crucial for Android devices, as it enables: google services apk android 5.1
If you only need basic functions (calls, SMS, light web browsing), you might even run Android 5.1 without updating Google Services at all – but expect many apps to break over time.
Here are some general guidelines:
Commonly referred to as Google Play Services , this APK is not a traditional app you interact with directly. Instead, it is a background service that provides Google APIs to both Google and third-party apps. For devices running Android 5.1, it acts as a bridge, allowing older hardware to access modern features like Google Maps integration and secure sign-ins. Key Features and Functions
Go to Settings → Security → Unknown sources (enable). Android 5
The is a background system app and service layer from Google. It is not the Google Play Store app itself, but rather a core component that allows other Google apps (and many third-party apps) to communicate with Google's servers and services.