SM-G9508 unlocking issue

Operation: Flash
Selected model: SM-G950U
Software version: 33.8

File analysis... OK
Total file size: 0x7C24983C (1986 Mb)
Searching USB Flash interface... COM5 detected
Setup connection... OK
Getting device info... OK
Reading PIT from phone... error

Done with Samsung Tool PRO v.33.8

I am trying to flash the combination file but it fail everytime error FIT,

help me please