error 53 during recovery mode

hi, I bought a Iphone 6, 20 days ago .

my phone had a software update ,so i updated that, it begin to start download update . after when i accepted terms and conditions it restart and begining installing the update.

during the update it show error 53 and went to recovery mode.

i connect it to itunes and choose restore. my pc download 1.75GB file and i wanted to restore my phone

but it had error53 again during the restoring and go to recovery mode.

i cannot bring it out.

please help me how i can fix it.

best regards

Hesam