[Q]where can I get stock signed firmware for flashing on a S-on sprint m8 non-HK topic

I'm trying to RUU a sprint htc one m8, I am htcdev unlocked, and currently running sinless rom 3.4.2, and the latest TWRP, now I know I must relock my bootloader in order to RUU and I already tried that.

here is my output when I run fastboot oem lock

Code:

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(bootloader) [PGFS] partition_update_pgfs: pg1fs_security
(bootloader) Lock successfully...
(bootloader) deinit_lcd
(bootloader) mipi display off
(bootloader) mdp_clock_off
(bootloader) turn off fd8c2308 failed 1 times. Try again...
(bootloader) disable_mmss_clk done
(bootloader) pll1_disable done
(bootloader) TZ_HTC_SVC_DISABLE ret = -1610744452 (0x9FFDFD7C)
(bootloader) [CRITICAL] SPMI write command failure:                        cmd_id = 0, error
(bootloader) = 4
(bootloader) [CRITICAL] SPMI write command failure:                        cmd_id = 0, error
(bootloader) = 4
(bootloader) [INFO] Rebooting device
ERROR: usb_read failed with status e00002ed
FAILED (status read failed (No such file or directory))
finished. total time: 1.251s

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but on the bootloader I see the tampered flag and re-locked flag with "security warning below

now here's my "getvar all"

Code:

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(bootloader) version: 0.5
(bootloader) version-bootloader: 3.18.0.0000
(bootloader) version-baseband: 1.08.20.0612_4
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: FA43ZSF02370
(bootloader) imei: **censored**
(bootloader) imei2: Not Support
(bootloader) meid: 99000499040678
(bootloader) product: m8_whl
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B70000
(bootloader) cidnum: SPCS_001
(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: d4c3cae5
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.007s

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here is what happened when I tried to flash the full firmware from O.M.J.'s post

Code:

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target reported max download size of 1830612992 bytes
sending 'zip' (6598 KB)...
OKAY [  0.807s]
writing 'zip'...
(bootloader) signature checking...
FAILED (remote: signature verify fail)
finished. total time: 1.046s

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and here is the output when i try to flash the rom.zip I extracted from htc's newest RUU exe

Code:

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./fastboot flash zip rom.zip
target reported max download size of 1830612992 bytes
sending 'zip' (1652270 KB)...
OKAY [ 47.785s]
writing 'zip'...
(bootloader) signature checking...
FAILED (remote: signature verify fail)
finished. total time: 108.972s

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any help is appreciated