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Released September 16, 2016. Models A1661, A1784, and A1785. Available in 32, 128, or 256 GB configurations in Rose gold, gold, silver, black, jet black, and (Product)Red.

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Unknown error (4000) when restoring iPhone

Just had a customer give me a phone which is in boot loop.

Plugged a new screen on, as the glass is broken, along with the home button and camera installed. but still the same.

So tried to restore, but get “unknown error occured (4000)”

whats the cause of this?

Thanks

Answer this question I have this problem too

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2 Answers

Most Helpful Answer

try restoring without the home button and camera connected to see if you get the same error

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In the end, I restored it with another camera.

After the restore, put the original camera back in and it started up fine.

Either unlucky the first few times, or a coincidence with the camera swap.

Either way, it's now up and running.

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Here’s a fix I found from Apple Support: https://support.apple.com/en-us/HT201263

Follow the steps provided in this support article, but remember to back up your phone before you begin: How to back up your iPhone, iPad, and iPod touch

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Cant back the phone up if it’s in bootloop, and already tried DFU mode

Thanks

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Sorry that didn't work for you! I'm at a loss. Good luck!

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Duane will be eternally grateful.
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