htc desire 820 stuck at logo screen

when goes to bootloader it shows

*** LOCKED***
A51_DTUL PVT SHIP S-ON
HBOOT -3.19.0.0000
RADIO-01.01.010_U10305041_08.01.50512
OS-2.10.720.4
eMMC-boot 2048MB
Nov 17 2015,17:29:04.0

HBOOT

SD checking...
no gift file...
loading...[ OPFJDIAG.zip]
No image !
loading...[ OPFJDIAG.nbh]
No image or Wrong Image !
loading...[OPFJIMG.zip]
loading...[OPFJIMG.nbh]
No image or Wrong image !

and when goes to recovery mode - apply from sd car - it shows- maping failed
please please help guys...