HTC m8 stuck at fastboot mode . can't flash any rom or TWRP?stock recovery

ADB not recognizing my device
C:\adb>adb devices
List of devices attached


C:\adb>adb reboot bootloader
error: device not found
error: device not found


C:\adb>adb devices
List of devices attached


C:\adb>adb reboot bootloader
error: device not found
error: device not found

C:\adb>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.12.401.4
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid:
(bootloader) product: m8_whl
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B17000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.037s

when i tried to install recovery

C:\adb>fastboot reboot
rebooting...

finished. total time: 0.013s

C:\adb>fastboot flash recovery C:\adb\openrecovery-twrp-2.7.1.0-m8.img
target reported max download size of 1826418688 bytes
sending 'recovery' (14826 KB)...
OKAY [ 1.399s]
writing 'recovery'...
FAILED (remote: not allowed)
finished. total time: 1.414s

C:\adb>fastboot reboot
rebooting...

finished. total time: 0.013s


i tried updating ADb drivers
- HTc fastboot

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