Can 'Triangle Away' reset knox counter to 0×0? I have a galaxy s5 duos (SM-G900FD) and my knox counter olis triggered to 0×1 (4) (due to some rooting and blah blah..) is it possible to reset knox to 0×0 with triangle away of any other method?
No, it is IMPOSSIBLE to reset the KNOX flag to 0x0 or 0.  Triangle away will only reset the flashcounter and will not reset the Knox flag.

Hope my answer helps