Is it really Google Play Services that the app needs or is it a different system component like WebView? WebView is a more likely app dependency, or maybe even Google Maps. If it is WebView then you can probably get a Zebra Lifeguard update to bring the device to a newer WebView implementation. A recent LG for the TC8000 L included a newer WebView so there is a chance the same was brought to the TC75 that is part of the same device family. 

Hi Matt,

As pr. the developer then it's notification/messaging and then google maps, so  I am looking into testing if i.e. webview, maps .apk installs could fix it. 

However it would be much more preferable to have it easily managed and updated in a single place(google play services apk etc.), neither of the current scenarios are particularly elegant for mantaining .

The devices have the latest/secondlatest LG update, so I did not expect that part to bring 5.x devices on par with current updates of managed google play services? (is it just webview?)