error 4013 Help please

I have the same error. 2 weeks before the end of contract as well. But that time has now lasped. I've tried reinstalling Itunes, rebooting DNF mode (is that the correct term), different cables, laptops, ports, removing all security software. Will the above software work? Usual find these extra programmes writen by others don't usually help. Would apple recommend that?

Can anyone else suggest anything else? Emailed apple, no reply yet. Please help, its frustrating as I need to use the old one.

Planned Obsolescence??

Tried that with three different computers. Will I be able to try in a apple store? Not one locally though. Old network provider wouldn't help.

Btw still no reply from my email to Apple.

I know it will sound very weird but it worked for me,I put my iPhone5s in a zipperbag and put it in a deep freezer for about 20-30mints, after that I tried restoring it and it worked very well, now its restored and working fine.

if nothing works you can try this out. All the best.