I have an HTC Once Mini that will not boot.
It has stock firmware on it (no root, no replaced bootloader, no custom recovery, just plain old stock HTC firmware).
It will start to the bootloader and responds to various fastboot commands, but will not boot to either Android or to the recovery. When I try to boot it to Android it simply reboots itself after a few moments. Likewise when I try to boot to recovery, but here it drops me back to the fastboot menu and says that bootup failed.
It is under warranty and will be returned to the shop, but I really want to extract the photos I took before it went belly up. There was no MicroSD card in it so the photos are on the internal storage.
I do not want to reflash anything or unlock the bootloader as it will be going back to the shop once I have recovered the photos and I don't want them throwing it back at me saying I invalidated the warranty.
All my searching seems to point to the same set of answers - using adb to retrieve the data, but as I can't get to either Android or recovery, adb is of no use to me here. I have read mention of some way to use fastboot to retrieve files, but my Google-Fu doesn't seem to help me actually find good set of instructions (and the fastboot help doesn't seem to give any clear indication of how you can use it to this end).