plz help me HTC m8

i need to upgrade my htc m8 to marshmallow plz help me
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.18.0.0000
(bootloader) version-baseband: 1.08.20.0612_4
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 1.54.651.8
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: FA45CSF03468
(bootloader) imei: 990004991352463
(bootloader) imei2: Not Support
(bootloader) meid: 99000499135246
(bootloader) product: m8_whl
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B70000
(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: d4c3cae5
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0