How to update android version maually?

[AC Question]

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...

 

[B. Diddy]

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?