Back to stock: Sprint M8 (HK) 4.4.4 help please topic

Code:

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*** Software Status: Modified ***
*** RELOCKED ***

(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.08.20.0916
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.31.654.2
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) product: m8_whl
(bootloader) platform: hTCBmsm8974
(bootloader) cidnum: SPCS_004
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 8a0f02ff
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.281s

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I want to go completely back to stock, or at least to the point I can install the OTA or something else for my phone. I have a stock recovery, S-ON, locked bootloader, but I am rooted and I can't figure out how to get back to where I can take the update.

I tried relocking the bootloader and flashing a zip file, it returned error 12.

I really need some guidance with this one. Any help is appreciated, thank you.