how to s-off in dhd

i have rooted with custom recovery desire hd (a9191) with cm11 (able to flash stock 2.3.5 by zip when needed)
i have serach lot but i cant found the method of turn off s (s-off)
anybody have idea how to do s-off in dhd
i have tried aahk hack tool that need to downgrade but unable to downgrade .zip by tool its make 0 kb on stock zip(got from ruu)

Here is detail of device
*** UNLOCKED***
ACE PVT SHIP S-ON RL
HBOOT-2.00.0029
MICROP-0438
RADIO-26.14.04.28_M
eMMC-BOOT
Dec 22 2011, 14:28...

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