Which RUU Can I Download?

[TheSUlake]

i Have a HTC m8 and no OTA (is 4.4.4 ver) so i want to upgrade but idk which ruu, so fastboot drop this

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.21.21331147A1.19_2G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.28.1540.5
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: ***********
(bootloader) imei: **************
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: BS_US001
(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: df77f8b7
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.188s

Edit:
Bootloader is unlocked but I wasn't me.
And when it boots up the logo says ''PTCi'' idk which carrier is, I'm not frum US.

 

[redpoint73]

(bootloader) version-main: 3.28.1540.5

(bootloader) modelid: 0P6B12000
(bootloader) cidnum: BS_US001

The above info indicates the phone is the US Developer's Edition.

The Marshmallow (last official version released) RUU is here: http://dl3.htc.com/application/RUU_M8_UL_M60_SENSE70_MR_BrightstarUS_WWE_6.12.1540.4.exe

To install RUU, you will need to lock the bootloader with command: fastboot oem lock

If you still get any errors running the RUU, let me know. For some (most) US versions of the M8, you need to flash the Marshmallow firmware (radio, hboot, etc.) in order to upgrade to Marshmallow RUU. Don't remember if this requirement applied to the Dev Ed.

Bootloader is unlocked but I wasn't me.
And when it boots up the logo says ''PTCi'' idk which carrier is, I'm not frum US.

You sure the boot splash screen doesn't say HTC? Although the HTC logo pretty clearly says HTC, so I believe you when you say it reads "PTCi" but just want to confirm. If you are seeing PTCi, it seems your phone has a different ROM installed (than the stock HTC Dev Edition ROM). Which would agree with the fact the bootloader has been unlocked. I'm not famililar with PTCi, so I can't be sure what the ROM differences are. But flashing the RUU should at least not have any affect on network connectivity (as ROM does not affect the network baseband). And the stock Dev Ed ROM (which will be installed by the RUU) is a pretty good one.