HTC ONE wont boot after kitkat update - T-Mobile HTC One (M7)

HTC One Tmo US fully stock and fully updated:
Ran the update. Verified it was all charged and, after it downloaded the update, left it and returned an hour or so later.
The phone was just sitting at the "HTC quietly brilliant". Left it for another hour and same thing. Did a factory reset and a cache reset. Still wont boot.
Instead of sending in the phone and getting a referb I want to root the device. However I can't turn fastboot off since the phone wont boot fully. Any ideas on how I can get the computer to see the phone so that I can request the token code to get my bootloader unlocked? Please HELP Thanks

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[Q] looking for some advice or help... boot loop?? or broken phone...

Have been rooting Androids for a while and have been about to solve all my problems by doing research and finding the solution... first time i actaully am stumped...
I have a HTC EVO 4G LTE, second one i had the first the microphone went bad, i rooted it just like the last one and it was running fine. I deleted a few system apps such as sprint music, friend stream, tunein radio, and an HTC app. forget what that was. but now my, at work today, keep restarting randomly and died very quickly. when i finally got a chance to charge it, it hung on a boot loop and then entered the system about 45 minutes later. and then quickly reset back into the boot loop, i have at least 25% battery at this point. it continues to cycle through this for the next 4 hours. i tried to just shut the system off but after like 10 minutes it would start the boot loop again and since i work at radioshack trying to fix it there really wasn't an option. I did try to boot into twrp and do a factory reset how ever when i attempted to boot in it just froze at the HTC screen and then reset into the boot loop.
Once i got home i relocked the bootloader and did a hardreset... to no prevail... it continued to reset i even took my memory card and then that seemed to solve it... i put the back cover on without the memory card and it almost instantly reset and continued through the boot loop until i removed the back cover again. i don't know to much about the making of this back cover but it does seem to have three sensers to know it if it on or off, i am assuming... i tried installing stock recovery and taken off root. the only thing i haven't does is a completely stock OS reset through an ruu... and if i do that i am taking the phone back to sprint and getting another new one... does anyone have any ideas? and if this same thing is posted somewhere i am sorry, i have searched and tried everything i found and so far aside from the stock reset nothing has really worked. i factory reset from system, fastboot, and twrp (it loaded only once). I did relock the oem and did uninstall root. removed micro sd and formated internal memory. any other suggestions
i would just run RUU.. if it still giving u problems take it to sprint.. if u runn a RUU and it goes away just root it again start fresh.,. thats what i would do
Thanks EVO. I did end up running ruu and when it completed it started the boot loop again. Almost all night and ended up heating the phone up to the point I just booted into bootloader so it would stop. It continued this morning. But here's the part I wanna know... I pulled the back cover off for sh*ts and giggles and it booted right up. I am actually posting from it. I am afraid to put the back cover on...
Soo... I confirmed it was the back. I used the phone to post that. Made several calls to sprint and talked to ny mother... Phone was fine. Replaced back, phone froze and went into boot loop until the back cover was removed.... Why though?...
soo... it looks like i wont be needing any help with this phone... as it has completely died..... won't even try to power on. well sprint see you tomorrow at noon!

[Q] Phone stuck, need help ASAP please

I recently acquired a HTC DNA from a friend of mine, and it was working fine for the last week. I applied an OTA Verizon update, it was part of a 2 part update, and it downloaded a fairly hefty update (took about 30 minutes to download) and when I hit ok to restart the phone to apply the update, i am stuck on the HTC quietly brilliant screen. It wont load anything. I booted into recovery, wiped cache, and rebooted. Still got nothing. Booted back into recovery, wiped all data and did a factory reset, and rebooted, still stuck at the htc loading screen. After talking to both Verizon and HTC directly, they basically told me im on my own. I have read up about sidebooting a stock rom (RUU or something like that). I downloaded the file from a guide i was following but i cannot even get my computer to recognize the device when i plug it in via USB. The phone is not rooted, and i am just looking to get it back up and running. Please help.
Yes the phone was charged to greater than 30% when i applied the update. (it was on the charger actually, if that affects anything)
Anybody have a similar problem when applying verizon's OTA update, and how can i get my computer to recognize the device so I can get this thing back up and running.
Thanks

Phone not working after botched update and factory reset..

I got a GPE M7 which had a botched update to lollipop where there was an error and I have to restart the phone. Since then I was unable to make any voice calling as I could not hear anything and voice dialing can also make the phone lose its reception. To get the reception back I usually have to restart it several times.
After that, I lived with it for a while, the google support told me to wipe partition cache from the recovery screen but it did not help. The y say they are unable to help me anymore. I tried to unlock the bootloader so I could flash a new ROM. I went through all the steps to get my Unlock.bin until I send the command to unlock the phone at the fastboot screen, it won't go into the screen where the phone will ask you if you really want to unlock the bootloader. So the phone remained locked.
I tried to factory reset it but now it just get stuck in the bootup screen, where the swirling color bubbles are and it won't stop. The longest I have tried is to let it sit there overnight and it used up all the battery (fully charged) and rebooting it up is still in the swirling bubble screen.
I finally tried HTC support and they say I could try to flash their ROM on it. I went through all their steps to flash their ROM on it but it won't accept it. The ROM installer would reboot it from fastboot, with the HTC logo and when it tried to send the ROM over to the phone, it just crash (error 155) and went into recovery. Recovery said that if I can see the HTC logo, I should be able to flash the ROM again. So I did, and then this time it ssai I have less than 30% battery left (Error 120) and refuse to update it, even though I tried three times with fully charged battery (LED is green and plugged in for hours).
Now HTC support is just ignoring after they instruct me to factory reset it again and it just won't work. I don't know what else to do. I have been without a phone for two weeks and I can't really afford a new one right now.
My carrier is Tmobile.

HELP My phone is bricked and cannot seem to recover it

Hello,
First of all, I just created an account to get help with a phone I have. I cannot seem to fix it, I contacted HTC support and the only option left is to return it to them for a fee to fix.
Details:
SIM unlocked AT&T HTC one m9
Issue:
After trying to update to marshmallow using the ruu 3.38.502.12 which is for AT&T phones, my phone is now bricked. There was an issue in the middle of updating, so my phone tried to revert back to the old recovery. During this step my phone glitched out and rebooted itself, now its stuck in a boot loop with no indication of a recovery or any OS.
I tried to redo the ruu update and I get an error saying my battery level is less than the % required, yet my phone screen is showing 100% battery.
I also tried placing the .zip file on a SD card and using "download" boot method to flash the rom "I get error saying no OS present"
I also tried fastboot but my phone isn't picked up by fastboot and sticks at waiting for device.
Any method that requires me to turn on debugging mode is useless because I cannot access the OS to turn this on.
Anyone have any other suggestions then what I've tried? Or is the only thing I can do is send it back to HTC and hope they can reflash the phone?
Thanks to all for the help,

updating a At&t htx onw m8 to 6.0

i purchased a htc one m8 and went to manually update it to android 6.0 and during the process it was stuck on sending. I stopped the program and unplugged the phone. Now i cannot get passed the htc one boot logo even after performing a factory reset. Help of getting the phone working again and updating it would be awesome.
You're going to need to get the RUU to install. Factory reset doesn't do anything but wipe user data. I'm guessing the RUU was writing to a partition when it stalled (or was interrupted) so you need to write it again, and only RUU is going to do that. If the RUU stalls again, try another USB port, another cable, even another PC if possible.

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