How to update HTC One m8 firmware ?

Hi guys. im kind of a noob with HTC devices so i want your help seniors :) I want to update the firmware of my htc one m8 from 3.18 to 3.28 so i can run MM roms im currently on 4.4.3 KK below is the getvar info any help would be very greatfull please help me

C:\Users\Ahmed Adeeb\Desktop\fastboot_adb>fastboot get
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.18.0.0000
(bootloader) version-baseband: 1.19.21331147A1.09G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 2.22.401.5
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 5e4b24e4
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.054s

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