Can’t Flash TWRP “Signature Verify Fail”

This is an ATT version phone I rooted this phone a couple of days ago with TWRP. However, I had to use adb to enter fastboot as it would not go to fastboot using power/volume keys. Actually, it never shows a fastboot screen, even in adb, so it may have been going into fastboot all along and I just could not see it.

So, instead of leaving well enough alone, I RUU’ed (newest ATT version from HTC site) it to try to get fastboot to work normally (it still works, I just can’t see it on screen). Now, I can’t get rooted again. FWIW, I did make a backup with TWRP before RUU’ed. Regardless, there is nothing on this phone I need to keep, I just want to root it before I start using it.

Any help is greatly appreciated…

Here is my unlock sequence. Note what happens if I try to flash TWRP immediately after unlock. I have to CTRL C and Reboot phone.

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot flash unlockt
oken unlock_code.bin
target reported max download size of 1826414592 bytes
sending ‘unlocktoken’ (0 KB)…
OKAY [ 0.110s]
writing ‘unlocktoken’…
(bootloader) unlock token check successfully
OKAY [ 0.012s]
finished. total time: 0.125s

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot flash recover
twrp30m8.img
^C

C:\Program Files (x86)\Android\android-sdk\platform-tools>adb reboot bootloader

Now when I try to flash TWRP, I get :

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot flash recover
twrp30m8.img
target reported max download size of 1826414592 bytes
sending ‘recover’ (20022 KB)…
OKAY [ 1.884s]
writing ‘recover’…
(bootloader) signature checking…
FAILED (remote: signature verify fail)
finished. total time: 2.611s

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 4.0.U605611@50319A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.28.502.2
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__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: 7f8e91a3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.089s

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot devices
HT445####### fastboot

C:\Program Files (x86)\Android\android-sdk\platform-tools>fastboot reboot
rebooting…

finished. total time: 0.013s