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The answer from me personally is no. The Know warranty void bit has been scrutinized and debated. Some, like myself, believe it is an eFuse (be sure to click on "Implementations" in that article).
Basically it is a hardware issue. The only way to reset it would be to replace the Motherboard.
Here's some discussion on the matter.
http://forum.xda-developers.com/galaxy-s6/general/discussion-knox-counter-t3124836
http://forum.xda-developers.com/galaxy-s6/general/knox-flag-reset-samsung-s6-t3217656