Originally Posted by serrano4 View Post

I have the HTC One (M7) from AT&T. The phone has never been rooted and I have not yet unlocked it bootloader. I have not done any of these modifications to it. I was simply using it when it turned off and then got really hot.

When I try to turn it on, the screen stays black even though it vibrates after 15 secs (like when it turns on). If I connect it to a wall charger the screen turns on with the battery icon and the red light blinking. I have drained the battery and tried the battery calibration trick (holding power and the vol + - buttons while using a bright light) and it has not worked.

When I plug it to my Windows PC it is not recognized except for today when it got recognized while I tried the battery calibration trick but the driver that was installed was something like this: Qualcomm HS-USB QDLoader 9008. I read in another thread that a user went through the same thin and some of the comments simply recommended him to take it to a store or that his motherboard was fried.

Is my phone bricked? Since I am not yet sure about this. And if not, is there a way to bring it back?
unfortunately QHSUSB_DLOAD mode means, as you said, a defective motherboard. You'll have to send the phone for repair.

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Useful links for the HTC One:
nkk71's SuperGUIDE to returning 100% back to stock
Flashing requirements chart by nkk71
HTC1Guru.com by crushalot