[Q] How many SW versions do we have??? topic

Hello All;

I am a computer engineer, but still I am a little bit confused. This is very hard to understand differences between them :rolleyes:
How many software's and also versions do we have on these HTC M8's??? :confused::confused::confused:

Hboot Version, Radio Version, OS Version, Bootloader Version, Baseband Version,
Kernel Version, Build Number Version
May be so on... :D :mad: :confused:
Could someone help me about this, I wanted to be fully updated with my unlocked AT&T device in Europe?

On the other hand;

I am also getting different version numbers between getvar all and Viper One - About Menu, why?
I tried to update with "4.16.401.10-Firmware-noredtext.zip" it said successfull.
But in viper menu, I am still getting different reults???

Viper One Says:
Baseband : 1.15.2133156.UA13G_20.18m.4096.04L
Build Number: 3.28.401.7 CL389838 release-keys

Here is getvar result:
F:\HTC>fastboot getvar all
< waiting for device >
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.25.214500021.06G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.16.401.10
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: xxx
(bootloader) imei: xxx
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__M27
(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: 3aa067db
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.018s

F:\HTC>