   Repair IMEI/Serial, Reset MSL:
1. Power on the phone.
2. Open dialer, type 319712358 and enter code 996412.
3. In opened menu choose "SIO Mode" and select "MODEM" for both options.
4. Connect USB cable, install drivers if needed.
5. Select Samsung diagnostic port in port settings.
6. Fill values what you need to repair.
7. Press "Repair" button.
8. Press "Reset MSL" button to deactivate security.
9. Wait till phone reboot.