I also had the same issue with my RCA tablet. I tried every troubleshooting step but nothing seemed to work until I manually downloaded the Google services update file (apk) online. Follow these exact steps and it will work for you too. First, go to '''settings'''> '''security'''> '''scroll down to unknown sources''', tap to select the switch and turn it on. Now open this link https://google-play-services.en.uptodown.com/android/download/1751067 tap on the download button, when a warning pops-up tap on '''OK''' to confirm. During the download, go to '''settings'''>'''storage'''>'''other'''>'''download''' and see the progress of the download. When its finished tap on the downloaded file, then allow for it to install. It will take around 10 to 15 minutes for the installation to complete. Once google play services is finished updating, tap '''done'''. Finally, restart the tablet. Google services will now be updated and all apps should start working. I hope that helped you.