I need some serious help... -.-"

After I Unlocked my Bootloader and obtained the root access, I recently S-Offd my M8 (By using Sunshine), and today I finally get the "SuperCid" as you can see in the following strings:

(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.12.401.4
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: SH443WM09430
(bootloader) imei: 358714058410873
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: RUU
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

My question is: Is it possible to Downgrade my Marshmallow Rom (Original with Sense7) to an Older version [HTC_M8_UL_K44_SENSE60_SECURITY_HTC_Europe_1.12.401 .17_Radio_1.14.2133156.UA24G_20.18h.4096.03L_relea se_356030_signed] (in my opinion if older it is better!), I tried to flash the 4.4 KK, but both with Ruu.exe and Ruu.zip gave me many errors (Error 41 when .zip and The process is stopped at step 0/7 when .exe), can someone suggest me something please? :'(
P.S.: Sorry because I'm a Noob and not so good at English...
Thanks in Advance Guys!!! :)

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