how flash htc 820 phone please help me

how flash htc 820 phone please help me

phone restart here htc logo
i am download flash file
'0PFJIMG_A51_DTUL_L50_DESIRE_SENSE60_MR_hTC_Asia_I ndia_2.10.720.4_Radio_01.01.010_U10305041_08.01.50 512_release_458938_signed_2_4_******************