I replaced the screen on a customers ipad air 1, (done hundreds without issue). After the repair the ipad is in a constant boot loop and flashes a red screen before starting again. Have removed the screen, discontected the battery, checked mounting etc. I’ve connected to itunes and put into dfu mode and tried to restore unknown error message 4013 appears. Itunes is the latest version. 
Anyone else encounter this problem? More importantly, does anyone have a fix! 
Thanks in advance. 
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Sorry for the late reply, I've had the same issue with a customers device just a week ago. Honestly we tried with different cables and in the end it worked. I downloaded the ipsw file separately and browse it from iTunes. Try different cables in different usb ports, and with this method, it worked for me.
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