[AC Question]

I got an HTC ONE M7 AT&T. I use it at europe, so i tried to load the europe version of software, but at 50% it frozen. Since than I can turn on the phone only bootloader, and nothing hapens. I cannot connect it with PC as a hard drive, so i cant do anything. A "professional" store said the processor burnt down, but is it is true, how is that possible to turn the phone on? PLEASE sb help me! I need this phone