Will flashing Carrier FW trip KNOX?

I have a 920W8 S6 originally from Bell but unlocked and being used on FIDO. It is currently running 5.1.1 Stock Bell firmware I recieved an update notification for 6.0.1 from bell, however after unlocking the phone and inserting my FIDO simcard the update no longer appears. I downloaded the new 6.0.1 Stock FIDO firmware from sammobile, would flashing this via Odin trip KNOX? Would switching from Bell -> Fido stock FW trip KNOX? I keep reading conflicting advice online about whether or not flashing stock carrier firmware is safe. Also is there any way I can tell for sure if the image I downloaded from sammobile is signed?

Thanks!

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