Originally Posted by CyberTbag
Will this trigger the Knox counter?
No. Flashing stock firmware will not increment Knox.
The exception might be trying to downgrade a Kitkat bootloader e.g. trying to revert 4.4.2+ to a version before 4.3. An attempted downgrade may soft brick yoir phone and change Knox in the process. Also those with locked bootloaders i.e. ATT, Verizon, Sprint, USC should not attempt flashing firmware from foreign carriers.
Normally only a custom kernel or recovery will increment Knox. It is possible that a bad flash e.g. power interruption or (rarely) a random glitch could corrupt Knox as well.