how to updated rooted htc one m8

hello guys. im a noob. kindly help me update my htc one m8 rooted s-on lollipop. to marshmallow. heres my fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.24.21331147A1.09G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.18.708.12 ---->>> WILL i DOWNLOAD THIS TWRP AND STOCK?
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: x
(bootloader) imei: x
(bootloader) imei2: x
(bootloader) meid: x
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B63000
(bootloader) cidnum: HTC__622
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 3aa067db
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.007s

i realy dont know what to download and what to do... please help.

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