I got the following log error in my route tracking activity:
06-24 18:50:24.488 7128-7759/com.noureddine_ouertani.www.wocelli50 E/DynamiteModule: Fa
By checking the internet for your problem about how to downgrade Google Play Service when the Uninstall Updates was grayed out. I came up with many possible solution. You can check it all and try if this method helps you.
If you have the Android Device manager app installed then this can also make the force stop/uninstall updates buttons be disabled.
If you uninstall the Android Device manager app and disable "Android Device Manager" as a device administrator then those options should be enabled.
From this forum, the solution here needs you to download and install System App Remover from the Google Play Store. Just check the forum link to know more about the steps and their information.
And lastly, you can also check the solution in the discusion of this forum page.
I solved the problem for my Huawei P8 Lite Android phone like this:
Here is the result: Downgrade of Google Play Services to 8.1.18