Help Repair GDFS; No Recovery Point; SEToolBox 3; No Credits

Hello! I need some help with my K510i. I overwritten the GDFS without knowing that it will damage the phone. I have no backup of my GDFS and someone told me that it should be done via SEToolBox 3.

My phone have no Recovery Point for its GDFS. Is repairing it by using the Test Point process will do? If so can anyone please tell me how it is done. Or is this video the way on how to do GDFS repair using Test Point?

YouTube - Reparar GDFS con Testpoint y setool box

I would be happy if anyone could help me. Thank you.