Htc one M8 stuck on logo screen

[therzvsm]

So my htc is 2 years old and it's starting to have some problems. Right now when I tried to restart it it just got stuck on the android logo. I've read a lot on the internet but since I am entirely new to this I decided to come here so i can get a valid answer on my current options. Do i have to use ruu to make it alive and if yes which version to download? Are there any there any other options? I got adb and fastboot on my windows. Right now the phone is connected to the pc with usb in bootloader mode. Here are some pieces of info about my phone
fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.12.401.4
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__032
(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: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!

Also , if i install the ruu, is there anything left to do after? or can i just reboot my phone and watch it open finally?

 

[redpoint73]

Right now when I tried to restart it it just got stuck on the android logo. I've read a lot on the internet but since I am entirely new to this I decided to come here so i can get a valid answer on my current options. Do i have to use ruu to make it alive and if yes which version to download? Are there any there any other options?

Also , if i install the ruu, is there anything left to do after? or can i just reboot my phone and watch it open finally?

You can try to do factory reset, wipe cache and Dalvik, all within bootloader/stock recovery. But if that doesn't help, we see a good amount of reports like yours, where it seems like the OS has been damaged or corrupt. In which case, simply doing factory reset or wiping cache, is not going to fix it.

In that case, RUU is certainly an option, and probably the easiest. The correct RUU for your device, plus instructions how to flash, can be found here: https://forum.xda-developers.com/showpost.php?p=64926626&postcount=6

Once RUU is installed, nothing else to really do. Just boot up the phone (hopefully will boot to Android OS) and setup the phone again. Note that RUU will wipe all personal data on the phone.

Another option is to unlock the bootloader, flash TWRP, and install a stock TWRP backup (stock ROM) as outlined in the following thread: https://forum.xda-developers.com/htc-one-m8/help/tutorial-how-to-stock-stock-twrp-t3086860
But note that unlocking the bootloader also wipes all user data. So you aren't gaining anything with this method, and it is a significantly longer and more complicated process. So again, I think RUU is your best bet.