unkown error (-1) restoring jailbroken iphone 4s

[Vertigooooooo]

hello, i had my iphone 4s 64 gb jailbroken with ios 8.4.1
i decided to restore it and delete the jailbreak, and so i put the iphone on recovery mode and went on itunes and hit the update & restore button.
at the end of the restore i get the unkown error (-1) and it fails to restore.

i am now stuck in recovery mode and cannot use my phone.
things i have tried:
1) downloading the ios 9.3.5 ipsw file and restoring to it.
2) removing the sim card and restoring in recovery mode
3) heating up the base band for a couple of minutes with a hairdryer and restoring (i have read it could be a hardware problem)

 

[J. A.]

Change the cable that connects iPhone to computer, if that doesn't help, use a different USB port on your computer.

For some, DFU mode was helpful. Here are the instructions:
DFU Mode for Dummies