upon download of ios 9 beta 1 to my ipad air 2 screen went black and came back as needing a restore. as I attempted restore a pop up stated unknown error code (-50). Need a solid assist as my air 2 is now a brick.
iOS 9 beta 1 unknown error code (-50)
That error doesn't appear in the relevant iTunes support page. However there is evidence to suggest that quitting iTunes, restarting your computer, and trying again fixes it. If it keeps recurring then there might be a problem with a firewall / system security or your internet connection as per: