Getting Error code (50) while restoring / updating

Hi.

I have recently had a problem with my iPhone 5C where the carrier settings completely dropped. I was recommended by my carrier themselves to restore the iPhone via iTunes to get the carrier settings back. In the process of doing this I was shocked to see "The iPhone "iPhone" could not be restored. An unknown error occurred (50)." and does this EVERY time that I attempt to restore it. It is now stuck in recovery mode!

I did it through my Macbook and got this message and through my Dad's Toshiba Laptop I got a (-1) code at the same part. The bar on the iPhone gets to about 60% and then freezes there until you take it out of the computer. It seems to always stop at verifying the firmware.

I have tried all i've found online (another USB / Firewall's / Up to date iTunes) and none have got me any further. Does anybody recommend anything else?

Thanks for reading,

Mitch