I just bought a iPhone 4 off Craigslist, and it's stuck on the iTunes screen. Whenever I try to restore it, towards the end of the process, an icon pops up and says error -1. What does this mean?
Unfortunately, according to Apple,
error -1 indicates a hardware issue. Specifically:
This may indicate a hardware issue with your device. Follow Troubleshooting security software issues, and restore your device on a different known-good computer. If the errors persist on another computer, the device may need service.