i wasn't using any software at that moment, just switching off the phone and connecting it to the computer while holding vol+ button, and it just stayed black. computer didnt detect anything at all. Then i tried using different hardware combinations and suddenly computer detects it as Zeus. I wanted to get into flashboot, and the instructions say to hold vol+ while connecting a shut-down phone to the computer, but after i did that nothing happened.
so basically by right, nothing could have tempered with the system files unless holding vol+ while connecting to usb will brick it.