How to fix Error Code 504 Can’t Install Facebook App On Android? Uninstall the App and clean up
1.Try uninstalling the Facebook app and Facebook messenger and reboot your phone.
2. Use a cleaning app such as Clean Master, CCleaner to clean up junk files on your phone.If you can’t install any new apps then clear the cache of the Facebook and Messenger app before uninstalling manually by going to settings,apps and finding Facebook-go to storage and clear cache.
3.Reinstall the Facebook app and messenger once more, it should install now.
Clear Cache
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