Only boots to bootloader

my boost mobile htc one sv will only boot to bootloader I've tried everything ...
adb says device not connected however fastboot shows it connected:

C:\Fastboot>fastboot getvar all
INFOversion: 0.5
INFOversion-bootloader: 2.21.0000
INFOversion-baseband: N/A
INFOversion-cpld: None
INFOversion-microp: None
INFOversion-main: 3.05.653.4
INFOversion-misc: PVT SHIP S-ON
INFOserialno: HT353S700064
INFOimei: 990001434866091
INFOmeid: 99000143486609
INFOproduct: k2_cl
INFOplatform: HBOOT-8930
INFOmodelid: PL8011000
INFOcidnum: SPCS_003
INFObattery-status: good
INFObattery-voltage: 4224mV
INFOpartition-layout: Generic
INFOsecurity: on
INFObuild-mode: SHIP
INFOboot-mode: FASTBOOT
INFOcommitno-bootloader: dirty-4dc34ae5
INFOhbootpreupdate: 11
INFOgencheckpt: 0
all: Done!
finished. total time: 0.100s

C:\Fastboot>
when I try using htc rom update it reboots phone and then hangs at waiting on bootloader

bootloader shows
unlocked
K2_CL PVT SHIP S-ON RL
HBOOT-2.21.000
OS-3.05.653.4
eMMC-boot 1024MB

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