How to restore or open my iPhone?

Hi,

my iPhone 6s cannot open nor restore.

it started when my Facebook app crashed overtime i open a Facebook Pages.

i tried to restart it (holding ON/OFF button & Navigation key together), bt still the Facebook crashes.

so i tried to uninstall my Facebook app, then re-install again.

while installing, the iPhone screen froze, even if i tried the Volume or ON/OFF button.

so i tried to restart again.

BUT,,,,,, to my surprise, i can't open my phone anymore.

i tried restoring it using my macbook but:

iTunes could not connect to the iPhone “xxxxxxxxx” because it is locked with a passcode. You must enter your passcode on the iPhone before it can be used with iTunes.

can somebody help me with this?

Thanks.


<Edited by Host>