Hi,
Reboot /restart device.
Go to settings >storage>cached data>clear cached data.
Go to settings>security>scroll down to
Device administrators tap on this
and see Android device manager,
Next to this " uncheck " in the box
(Deactivate).
go to settings>storage>apps>google play services>uninstall updates.
play services update automatically.
leave the device for some hours/over night.
plug in the charger and connect to a stable wifi.
if it not updates,or you want a force update,
go to settings>storage>apps>google play store>clear data.
go to settings>storage>apps>download manager>clear data.
go to settings>storage>apps>google play services>uninstall updates.
Now open the link below.
http://www.apkmirror.com/apk/google-inc/google-play-services/
Here scroll down to the latest version
and tap on it.
see next google play store icon.
tap on the play store icon.
reboot/restart device.
Now go to settings>>>>Android device manager >activate.