boot loop iphone 6

Hi,

I am using iPhone 6 (128 GB), i recived ios 9.3.1 update & tried to install it using itunes (Mac OS X EI Captian v 10.11.4) Eventually device get restarted and installation interrupted, due to the effect of this i couldn't boot up my device.

Then i tried to restore through itunes in DFU mode, it gets hang after "restoring iphone firmware success" step. its shows 90% progress bar with apple logo there is no response since 8 hours.

When i tried to force restart (Home + wake up button) the booting process is looped again and again (its showing apple logo with empty progress bar after the long interval phone goes blank then it shown small spinner & its repeats again and again.