RUU is not working for my M7. topic

I have an AT&T M7 flashed with Cyanogenmod 10 that I would like to restock. I've tried the RUU_M7_UL_K44_SENSE55_MR_Cingular_US_4.18.502.7_R1 0_Radio_4T.24.3218.09_10.26.1718.01L_release_35656 5_signed_2, but that is not working.
I mean it starts to run and then after asking for aproval it desapears.
I also tried the RUU_M7_UL_JB_50_Cingular_US_1.26.502.12_Radio_4A.1 4.3250.13_10.33.1150.01_release_318450_signed_2, and this one runs but at the end it says that is not compatible with my phones firmware.

This is the phone info:

M7_UL PVT SHIP S-OFF RH
CID-CWS_001HBOOT-1. 56. 0000
RADIO-4T. 24. 3218. 09
OpenDSP-v32. 120. 274. 0909
OS-4. 18. 502. 7
eMMC-boot 2048MB
Jan 28 2014, 09: 32: 41. 0

What is the simpliest way to go back to stock?

Thanks in advance.

Getvar:

fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.56.0000
(bootloader) version-baseband: 4T.24.3218.09
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.18.502.7
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0712000
(bootloader) cidnum: CWS__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4284mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-c6bbb6d4
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.065s

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