My htc one was downloading a system update this morning, and then later on after a phonecall my phone switched off and i now think it was updating the system. I stupidly pressed the power button and then got the red exclamation mark screen. I have tried a hard reboot but only get HTC white screen then black. I have entered recovery mode and tried to update from phone storage but that failed. Please help me, i only want to backup my photos of my sons birth.