sir ! why cant unlock this? boot loader 60.2 i think. conection ok but cant successful unulock

try unlock again, because c975 boot loader 6.31 must unlock via testpoint or remove rsa.
Goodluck.

Try to take a good look at the boot loader once again because boot loader 6.3.1 can be done by remove RSA as sources has said. But if your boot loader is higher like 6.3.6, you definitely cannot do that easily. You need to do test point and I think an Infinity Box would be better to make use of instead of a smart-clip.

c975 unlock problem