Google Account Manager 5.1 Lollipop.
On this page, you can download the Google Account Manager 5.1 APK. Android smartphones will use the Google account for verification.
Google account manager will manage your account in order to access most features from Google. After opening this application, type your password and Gmail for verification then select a method to verify.
This account manager application actually helps you to remove the FRP Lock if you have an FRP lock (factory reset protection) on your android device.