I bought a second-hand Galaxy S7 last year from a chain of resellers, and recently the wifi kept on dropping out after installing a new router. Other connected devices did not lose the signal, and after resetting the router I looked for advice online, and the consensus was to perform a factory reset. Now when I try to login with my Google account to restart it I keep getting the message 'Something went wrong there. Please try again.'
It's been several days now, I've tried leaving it for 24 hours, but I cannot get past this message and seem to be left with a phone I cannot use. I asked the shop I bought it from for advice but they said they would not be able to help and suggested contacting you instead.