I can provide temp solution for making your phone rework for around 1 day / until you enter to Google Play Store again / Google force update. Sorry I am using Chinese language in my phone, maybe some config is a bit different.

1st: Download Google Play Service 14.5.82 (https://www.apkmirror.com/apk/google-inc/google-play-services/google-play-services-14-5-82-release/)
2nd: Disable Auto Update in Google Play App (You can only see white screen,? Just swipe right, the setting screen will appear)
3rd: Disable background data usage for Google Play App (Security --> Traffic Manage --> background data usage?)
4rd: Disable Google Play Service (Setting --> App --> Running?)
5th: Install the Google Play Service 14.5.82
6th: Reboot

It should fix the problem temporary, until you access to Google Play Again / Google force you to update to 14.7.99. You can repeat 5th & 6th if the google play service update to 14.7.99 automatically.

Edited by User5210109248 at 2018-12-13 09:19

I have use following steps for solving Google Play Service issue and my phone (M2 & M3S) is working normal for 3 days now. . If you are using Gmail App, sorry this cannot help.

1st: Download Google Play Service 14.5.82 (https://www.apkmirror.com/apk/google-inc/google-play-services/google-play-services-14-5-82-release/)
2nd: Disable Auto Update in Google Play Store (You can only see white screen? Just swipe right, the setting screen will appear)
3rd: Disable background data usage for Google Play Store (Security --> Data --> Network access --> Background --> Google Play Store--> Disallow background data connection)
4th: Disable Google Play Store run in background (Security --> Permissions --> Run in background --> Google Play Store --> Disallow running in background)
5th: Disable Google Play Services "Turn on mobile network" & "Turn on mobile WLan" (Security --> Permissions -->  App permissions --> Google Pay Services --> Find "Turn on mobile network" & "Turn on mobile WLan" and set Reject)
6th: Disable Google Play Service (Setting --> Apps --> Running --> Google Play Services --> Stop all things)
7th: Install the Google Play Service 14.5.82
8th: Reboot

The problem should be fixed, and you can use Google Play Store, Youtube (version 13.48.51)and Map. Howver, don't use Gmail App, it will auto update the Google Services. Sorry for my bad english.

Meizu was my favourite band in the past. I hope I will like this brand in the future

It should be Google Play Store

Edited by User5210109248 at 2018-12-11 17:16
I cannot help if you do not tell me that what screen or what your device look like after implement it... And this method is for Android 5.1 / Flyme 6.2.0.0G.

You can try Youtube version 13.48.51.  It work fine in my m2

Uninstall the youtube first, I am not sure you have try arm64-v8a or armeabi-v7a version. I am using v7a one .
https://www.apkmirror.com/apk/google-inc/youtube/youtube-13-48-51-release/youtube-13-48-51-20-android-apk-download/