I did a factory reset to my samsung galaxy J7 primer sm-g610m and when I turned on the phone I was asked to type the name of the gmail account and password, I did so (that was the account I have always used in that phone, and never changed the passwrd) and It says "unknown error. Wait for 24 hours and try again". Then I re-enter the same account with the password and it says invalid password. The password is CORRECT because I can normally access my account from a PC, from another phone and the password is the correct one. wHY I CAN{T GET ACCESS TO MY GMAIL ACCOUNT IN THAT PHONE AND WHAT CAN I DO ABOUT IT???????