HTC OPFJ100 D820u

Hi help me flash this model HTC OPFJ100 D820u
problem : when power on shows HTC logo than keeps restarting in fastboot mode its showing adb connecting but not making com port it is showing like this
software status:official***
***Locked***
A51_DTUL PVT SHIPS S-ON
HBOOT-3.19.0.0000
RADIO-01.01.010_U10305041_08.01.50512
OS-2.10.720.1
eMMC-boot 2048MB
sep 18 2015 , 02:54:06.0