Android 5.1.1 blocks installations from outside the official store by default. You must lift this restriction temporarily. Open your device .

Before you can install an app from outside the Play Store, you need to give your device permission. On Android 5.1 Lollipop, the steps are simple:

Go to APKMirror and search for "Google Play Store" and select a version from late 2018/early 2019. 3. Step-by-Step Installation Guide (Verified Method)

If you are using a custom ROM, you may need to re-flash the OpenGApps 5.1 package. Summary of Best Practices

No. Installing a newer Play Store APK does not delete apps, accounts, or saved games. However, clearing Play Store data (as advised above) will not affect your downloaded apps.

Look for versions labeled "Android 5.0+" to ensure compatibility.