If you're experiencing trouble logging in or syncing app data on your Mi TV P1 55, for your reference, here are some troubleshooting steps you can refer to:
1. Check Internet Connection: Ensure that your Xiaomi TV is properly connected to the internet. Weak or unstable internet connectivity can hinder login and syncing processes.
2. Restart the TV: Turn off your Xiaomi TV, unplug it for a few minutes, and then plug it back in. Turn it on and check if the login and syncing work.
3. Check Google Account Credentials: Ensure you're using the correct Google account credentials to log in. Verify that your account information is accurate.
4. Update the System: Ensure that your TV's firmware and the apps you're having trouble with are up-to-date. Go to [Settings] >> Select [Device Preferences] >> Select [About] >> Select [System update] >> check for update.
5. Clear App Data and Cache: For the specific apps causing trouble, you can clear their data and cache. To do this, please go to [Settings] >> [Apps] >> select the app >> [Clear Data] and [Clear Cache].
6. Factory Reset (last resort): If all other methods fail, please reset your TV to the factory defaults. Go to [Settings] >> select [Device Preferences] >> select [Reset] option >> select [Reset].
We hope the above methods can resolve the issue. If the issue still persists, you could submit your feedback on your TV by going to [Settings] >> [Device Preferences] >> [Home screen] >> [Send feedback].