i just did update. phone says has to reboot to factory settings..accepted .... now says phone cant be rebooted and wont turn on... or off... phone does NOTHING..
lol i dont know what a DFU is.... think i got it doing something... resetting entire phone as if it was brand new... i am HOPEFULLY restoring from backup earlier today... so it says restore in progress... maybe it will work...
Have you tried putting it in DFU Mode and connecting to iTunes on a computer?
Sounds like you found it. Good luck.
Read this for more information.
https://discussions.apple.com/thread/5269891