The reason is simple. Google frequently updates its core apps, but automatic updates often fail on older operating systems. The solution? Manually downloading and sideloading the compatible with Android 5.1.1.
If the Google Play Store refuses to connect due to Google deprecating server-side support for Lollipop, you can use independent app repositories to safely download older, compatible versions of your favorite apps. The reason is simple
: Search for Google Play Store 17.9.17 or Google Play Store 19.x . The reason is simple