How to update android version maually?

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I was told I cant use my Google account on my device because my android version wont update.. I get a error message trying to sign in Google only from my phone..

"Can't establish a reliable data connection to the server.
This could be a temporary problem or your SIM card may not be provisioned
for data services. If it continues, call Customer Care."

I have troubleshoot with Samsung and at&t and Google. Everything is not working its been two weeks now. Factory reset, date & time check, clear cache, etc...
 
Welcome to Android Central! Which phone? Assuming you haven't been notified recently of any official system updates, your phone is probably up to date, so upgrading the system to a more recent Android version would require rooting and flashing a custom ROM. This wouldn't necessarily solve your problem.

Does your sign-in problem occur regardless of being on mobile data vs wi-fi? Have you tried different wi-fi networks?
 

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