nokia lumia 635 test mode not detected by best

nokia lumia 635 test mode not detected by best
other lumia phones like 820 , 1250 working good and unlock done by same drivers and same compuers and same usb
635 detected in normal mode and read info ok but when i put it to test mod not detected
i used drivers from infinty support erea Lumia_WP8x_Drivers

whats probelm and how i can unlock this phone ??