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help please, wont boot up

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Default help please, wont boot up

Hi i am a bit of a n00b here.
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.
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Go to recovery when it show red Mark press volume up + power for 2-3 seconds then leave them you will get options
Wipe cache is only your hope
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