Son and I both have absolutely stock TMo HTC Ones. Mine is fine.
His had all his music on it, and his music was not backed up. (His laptop's hard drive crashed just two weeks ago and he had not gotten around to restoring his music yet. He is not having a good month with tech.)
His phone without warning entered a boot loop. It restarted itself, reached the bootloader/simply brilliant splash page, reached the T Mobile LTE splash page, reached the HTC One Beats Audio splash page, dimmed a bit, went blank, and then restarted the boot sequence. This goes on infinitum, and even after we let the phone battery run down to zero, recharged and started it again.
We can enter the bootloader by pressing volume down and the power key at the point where the screen goes blank after the HTC One Beats Audio splash, and from there we can go to recovery or into fastboot. When in fastboot, the phone can be connected to a computer, where it shows up as an "unspecified" device called Android 1.0. This device does not show up as a storage device - so we don't see the files. It has a driver called MyHTC. The phone screen shows FASTBOOT USB in red, but running adb with the command adb devices doesn't show anything in the device list.
As I said, the phone is absolutely stock - that means it is locked, and never was unlocked. And I understand that unlocking the bootloader to install a custom recovery would wipe the data files, thus defeating the purpose of the exercise.
We won't mind trying a factory reset, or even trying to root the phone, if we can first get to the music and save it. Is there some way to save it?
Now, mind you, two days ago terms like adb, bootloader, Android SDK, custom recovery, etc., were completely foreign to me. These are things I have picked up trying to solve the problem with Google and personal grit. So please bear that in mind when answering.
Is there some way to access the data files on this phone from the bootloader screen or from the recovery screen? If the phone can't be booted up and the phone can't be unlocked without being wiped clean, it seems my son is going to be spending a lot of time and money recreating his music library. Is this true? Have we finally found a situation that Dad can't rescue his offspring from?
Thanks in advance for any ideas...