[Q] how to flash firmware topic

hi all

i have Universal HTC ONE , and i need to flash the 4.4.2 update

i haven't the firmware, and i don't know hot to flash it

thanks all

C:\ADB>fastboot getvar all
INFOversion: 0.5
INFOversion-bootloader: 1.55.0000
INFOversion-baseband: 4A.21.3263.04
INFOversion-cpld: None
INFOversion-microp: None
INFOversion-main: 3.62.401.1
INFOversion-misc: PVT SHIP S-ON
INFOserialno: **************
INFOimei: **************
INFOmeid: 00000000000000
INFOproduct: m7_ul
INFOplatform: HBOOT-8064
INFOmodelid: PN0710000
INFOcidnum: HTC__J15
INFObattery-status: good
INFObattery-voltage: 3916mV
INFOpartition-layout: Generic
INFOsecurity: on
INFObuild-mode: SHIP
INFOboot-mode: FASTBOOT
INFOcommitno-bootloader: dirty-bb768ae1
INFOhbootpreupdate: 11