After upgrading from FW 4.3 to 4.3.1 (not jailbroken) I have this error 1013 and my phone would not come out of this loop.
I followed the instructions for Windows XP and deleted the line, restarted iTunes and then my phone succesfully went through the restore.
Lost all the stuff of the phone but retained it allon iTunes so just a pain to now put all the stuff back on my phone but a good excuse for a clear out
yeah pkgbackup is worth the $5 bucks and it saves all the urls to the files you have in your contacts so when you backup in itunes it backs up all your cydia apps so when you do re jailbreak it can re install everything after you re install pkgbackup 1st ofc it used to be a real pain having to re install everything, but now the only pain is when you upgrade and a lot of apps dont work on that latest firmware