[One (M9) Android Development] nkk71:
tested successfully, running it now, as you suggested removed the files in red strike:

23/06/2015 12:18 741,760 aboot_signed.img
23/06/2015 11:58 10,195,968 adsp.img
23/06/2015 15:27 584 android-info.txt
23/06/2015 15:27 75 android-info2.txt
[B][COLOR="Red"][STRIKE]23/06/2015 12:10 304,087,040 apppreload.img[/STRIKE][/COLOR][/B]
23/06/2015 15:34 584 backup_android-info.txt
23/06/2015 12:01 898,063 bootloader
[B][COLOR="Red"][STRIKE]23/06/2015 12:18 36,433,920 boot_signed.img[/STRIKE][/COLOR][/B]
23/06/2015 11:58 9,544 cir.img
23/06/2015 12:10 62,914,560 cota.img
23/06/2015 11:58 1,055,744 cpe.img
[B][COLOR="Red"][STRIKE]23/06/2015 12:01 9,011,200 dt.img
23/06/2015 12:09 11,056 dzdata_16g.hdr
23/06/2015 12:09 598,320 dzdata_16g.img
23/06/2015 12:10 20,160 dzdata_32g.hdr
23/06/2015 12:10 944,320 dzdata_32g.img
23/06/2015 12:10 23,952 dzdata_64g.hdr
23/06/2015 12:10 1,180,560 dzdata_64g.img[/STRIKE][/COLOR][/B]
23/06/2015 12:02 741,760 emmc_appsboot.mbn
23/06/2015 11:46 17,408 gpt_main_32g.img
23/06/2015 11:46 17,408 gpt_main_64g.img
23/06/2015 12:18 39,043,072 hosd_signed.img
23/06/2015 11:58 66,578 hyp-8994-1.img
23/06/2015 11:58 1,572,864 modem_st1.img
23/06/2015 11:58 1,572,864 modem_st2.img
23/06/2015 12:02 4,341,932 persist.img
23/06/2015 11:58 5,484 pg2fs_ship_signkey.img
23/06/2015 11:58 39,286 pmic-8994-1.img
23/06/2015 15:27 52,954,112 radio.img
[B][COLOR="Red"][STRIKE]23/06/2015 12:05 2,133,046 ramdisk.img[/STRIKE][/COLOR][/B]
23/06/2015 15:27 296 rcdata.img
[B][COLOR="Red"][STRIKE]23/06/2015 12:18 38,670,336 recovery_signed.img[/STRIKE][/COLOR][/B]
23/06/2015 11:58 196,012 rpm-8994-1.img
23/06/2015 11:58 706,914 sbl1-8994-1.img
23/06/2015 11:58 35,168 sdi.img
23/06/2015 11:58 467,372 sensor_hub.img
[B][COLOR="Red"][STRIKE]23/06/2015 15:27 4,194,304 splash1.nb0[/STRIKE][/COLOR][/B]
23/06/2015 11:58 49,189 tp_MXM11876.img
23/06/2015 11:58 63,004 tp_SYN3351.img
23/06/2015 11:58 531,858 tz-8994-1.img

flash log:

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]adb reboot download[/COLOR][/B]

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot getvar all[/COLOR][/B]
(bootloader) kernel: lk
(bootloader) product: htc_himauhl
(bootloader) version: 1.0
(bootloader) imei: 35blarp
[B][COLOR="Green"](bootloader) version-main: 2.10.401.1[/COLOR][/B]
(bootloader) boot-mode: download
(bootloader) version-baseband: 01.04_U11440601_71.02.50709G_F
(bootloader) version-bootloader: 1.0.0.0000
(bootloader) mid: 0PJA10000
(bootloader) cid: HTC__001
all:
finished. total time: 0.062s

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot oem rebootRUU[/COLOR][/B]
...
OKAY [ 0.047s]
finished. total time: 0.047s

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot flash zip M9_RUU_2.6.502.16_nostuff.zip[/COLOR][/B]
target reported max download size of 800000000 bytes
sending 'zip' (49049 KB)...
OKAY [ 4.700s]
writing 'zip'...
(bootloader) HOSD CL#576582
(bootloader) GPT is up-to-dated. [17408]
(bootloader) Perform pre-update
(bootloader) start@19
(bootloader) aboot_signed.img@100%
(bootloader) adsp.img@BYPASS
(bootloader) cota.img@BYPASS
(bootloader) cpe.img@BYPASS
(bootloader) hosd_signed.img@100%
(bootloader) hyp-8994-1.img@100%
(bootloader) modem_st1.img@BYPASS
(bootloader) modem_st2.img@BYPASS
(bootloader) pg2fs_ship_signkey.img@BYPASS
(bootloader) pmic-8994-1.img@100%
(bootloader) rcdata.img@BYPASS
(bootloader) rpm-8994-1.img@100%
(bootloader) sbl1-8994-1.img@100%
(bootloader) sdi.img@100%
(bootloader) sensor_hub.img@BYPASS
(bootloader) tp_MXM11876.img@BYPASS
(bootloader) tp_SYN3351.img@BYPASS
(bootloader) tz-8994-1.img@100%
(bootloader) radio.img@BYPASS
[B][COLOR="Red"]FAILED (remote: 90 hboot pre-update! please flush image again immediately)[/COLOR][/B]
finished. total time: 6.715s

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot flash zip M9_RUU_2.6.502.16_nostuff.zip[/COLOR][/B]
< waiting for device >
target reported max download size of 800000000 bytes
sending 'zip' (49049 KB)...
OKAY [ 3.986s]
writing 'zip'...
(bootloader) HOSD CL#556209
(bootloader) GPT is up-to-dated. [17408]
(bootloader) start@19
(bootloader) aboot_signed.img@100%
(bootloader) adsp.img@100%
(bootloader) cota.img@100%
(bootloader) cpe.img@100%
(bootloader) hosd_signed.img@100%
(bootloader) hyp-8994-1.img@100%
(bootloader) modem_st1.img@100%
(bootloader) modem_st2.img@100%
(bootloader) pg2fs_ship_signkey.img@100%
(bootloader) pmic-8994-1.img@100%
(bootloader) rcdata.img@100%
(bootloader) rpm-8994-1.img@100%
(bootloader) sbl1-8994-1.img@100%
(bootloader) sdi.img@100%
(bootloader) tz-8994-1.img@100%
(bootloader) radio.img@100%
(bootloader) sensor_hub.img@BYPASS
(bootloader) tp_MXM11876.img@BYPASS
(bootloader) tp_SYN3351.img@BYPASS
(bootloader) Update zip file OK
(bootloader) end@Done
OKAY [ 8.623s]
finished. total time: 12.611s

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot reboot-bootloader[/COLOR][/B]
rebooting into bootloader...
OKAY [ 0.000s]
finished. total time: 0.000s

C:\ADB_M9_1.0.32>[B][COLOR="Blue"]fastboot getvar all[/COLOR][/B]
(bootloader) kernel: lk
(bootloader) product: htc_himaulatt
(bootloader) version: 1.0
(bootloader) imei: 35blarp
[B][COLOR="Green"](bootloader) version-main: 2.6.502.16[/COLOR][/B]
(bootloader) boot-mode: download
(bootloader) version-baseband: 01.01_U11440601_72.02.50602A_F
(bootloader) version-bootloader: 1.0.0.0000
(bootloader) mid: 0PJA10000
(bootloader) cid: HTC__001
all:
finished. total time: 0.078s

C:\ADB_M9_1.0.32>

EDIT: obviously i changed MID and CID in the android-info to do this on my non-AT&T phone