Solution no 1:
1.First you have to switching on the device by using the Power key.
- From the Home Screen go to Menu and then to Settings.
- Tap Reset and then select Master Reset.
- In the next step choose Yes to confirm the whole operation..
- To begin hard reset process type in the following safety code: 1234.
- That's all.
master reset code for all Samsung mobile phones.
Solution no 2:
1.First you have to switching on the device by using the Power key.
- In the next step tap the following code in your phone: *2767*3855#
- You should see information about resetting your phone.
- Wait to complete the whole process.
- Well done! The hard reset has just been performed.