Q: Iphone6s error'd during software update - can't restore as the phone is disabled, and can't trust the computer to connect and restore

I was prompted that there's a new software update ( 9.0.2) when I plugged my iPhone 6s into Itunes. via Windows. The software update failed and was told to restore it to factory settings. iPhone is now disabled and in recovery mode.

I clicked on "restore and update" - iTunes then went through the process of extracting the software, preparing the iPhone for restore.

This is where it fails - error code 6. I had a look at this and came to the conclusion that it was due to not being able to trust the computer.

How do I get around this?