@ alhamde16,
If C975 r245_u82.21.80i original firmware version and the boot is 0.5.f.1, then you can unlock it with simple "One Button" method.
If original firmware version was R245_U_82.21.91I then it can be unlocked with new version of Smart-Clip and SmartMoto.
Best Regards
Smart-clip team
www.smart-clip.com www.GsmServer.com www.boot-loader.com www.smart-unlocker.com