Change CSC Galaxy S7

Hello hello,

i want to flash a new firmware, but it doesn't work.

I have a S7 SM-G930K and want to install a SM-G930F Firmware.
I downloaded all the files (AP,BL,CP,CSC), added phone in download mode to Odin and tried to Flash.
It just starts and stops immediately. (Pit Security Check failed).

Where is the mistake?


Thanks for helping!