How to fix an unknown error occurred (−1) − iPhone, iPad, iPod touch (Nothing else worked)
Why does iTunes error -1 occur? How to fix it?
The device cannot be synced − an unknown error occurred (-1) popup in iTunes appears when you try to update or restore your iPhone, iPad or iPod touch via iTunes, using your computer.
The common reasons behind this error include:
- Outdated iTunes version;
- Outdated operating system;
- Damaged iTunes files;
- Malicious software.
We put together a list of solutions that should fix this error, if read them carefully, and follow the instructions.
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Reinstall iTunes
0(0)0(0)If you tried all the other solutions, but none of them worked, consider reinstalling iTunes, by uninstalling it and then downloading and installing the latest version.
Check out the don't know how to uninstall a program guide, if you are not sure how to uninstall programs.
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Replace the USB (lightning) cable
0(0)0(0)Consider replacing the USB (lightning) cable, if you tried all the solutions, but none of them worked, and you have ensured that both your iOS device and computer function properly.
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