S-OFF and downgrading M7CDUG

I have been trying lately to go back to android 4.4.3 instead of lollipop on my M7 dual sim.. so far I found this is RUU

Code:

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OTA updates (for Android 4.4.3):
OTA_M7C_DUG_K443_SENSE60_MR_HTC_Nordic_6.13.402.2-5.17.402.6_release_389543.zip - 392.32 MB

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From this thread http://forum.xda-developers.com/show....php?t=2617159

My fastboot values:

Code:

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(bootloader) version: 0.5
(bootloader) version-bootloader: 2.49.0000
(bootloader) version-baseband: U3.19.3509.04
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 7.17.402.15
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) meid: 00000000000000
(bootloader) product: m7cdug
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0771000
(bootloader) cidnum: HTC__J15
(bootloader) battery-status: good
(bootloader) battery-voltage: 3756mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-d0e3b226
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

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According to the one who posted the RUU, my CID, phone model, version match, however, I saw some posts that I need to S-OFF in order to downgrade using a RUU so I kind of need help, or a some sort of guide.
Also, is it 100% sure that the OTA will work fine with my phone? Do I need anything else to be matching to downgrade using the RUU?

Downgrading process of lg g3 stylus

If anyone can please help me to downgrade my device please

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