I’m not an Android guy yet, but I have unmatched faith in Google search
Today my daughter’s friends brought a touchmate 7” tab to me, complaining the Google play store doesn’t work. I didn’t have a clue, and my very second Google search brought me to the correct solution. Solution was something we hardly think of at the first place.
Those kids changed the system date and time to a past one! Reconfiguring the system date and time to the current resolved the issue.
Google should have better and meaningful error messages for such important components of Android system! What you think?