1

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?

2

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.

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