No os HTC M8 stuck at HTC logo screen

I accidentally wiped my os and rebooted the phone and from then the phone got stuck at HTC logo screen and not responding to power and volume keys plz help in urgent need!!!

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/ask-question/758016-no-os-htc-m8-stuck-htc-logo-screen-new-post.html
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