If you had forget the pattern/password of freedom 251 or it has got Stuck/Hang on logo or forget GMAIL password, then hard reset is the optimal solution.
1- Freedom 251 must be 70 percent charged to perform reset.
2- Switch off your device.
3- Press & hold Power + volume up key until recovery menu appears.
4- Now, using volume keys select Wipe Data/Factory reset.
5- Now, choose Yes-delete all user data.
6- Your mobile will reboot and will be free from pattern.