Try these steps first
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- On a Mac with macOS Catalina 10.15, make sure your Mac is up to date. If you have a Mac with macOS Mojave 10.14 or earlier, or a PC, make sure you have the latest version of iTunes.
- If your device couldn't be restored and you get a message that 'an unknown error occurred [error number],' use these steps.
If you still see the error, try the steps below. Dmg title song sad version.
Choose your error number or message
- 1, 2, 3, 4, 6, 9, 10, 11, 12, 13, 14, 16, 17
- 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37,
40, 53, 56 - 1002, 1004, 1011, 1012, 1014, 1015
- 1600, 1601, 1602, 1603, 1604, 1611, 1638,
1643–1650, 1667, 1669, 1671 - 2001, 2002, 2005, 2006, 2009
- 3002, 3004, 3013, 3014, 3015, 3194, 3200
- 4005, 4013, 4014, 4037
- 'Cellular Update Failed.'
- 'Apple Pay Not Available on this iPhone.'
- 'There was a problem downloading the software.'
- 'The device isn't eligible for the requested build.'
- 'Invalid response.'
- 'The required resource can't be found.'
Make sure that your device can communicate with Apple servers
If you see error 1671, your computer is downloading necessary software. Wait for the download to finish, then try again.
If you see one of the errors below, your computer might not be able to connect to Apple servers or your iPhone, iPad, or iPod touch:
- 17, 1638, 3014, 3194, 3000, 3002, 3004, 3013, 3014, 3015, 3194, 3200
- 'There was a problem downloading the software.'
- 'The device isn't eligible for the requested build.'
![Download failed network error chrome Download failed network error chrome](/uploads/1/2/6/6/126620573/936706777.png)
Here's what to check:
- Make sure that your computer can communicate with the Apple software-update servers.
- Check your third-party security software.
If you see error 4037, your computer is unable to update your device because it's passcode locked and the device wasn't unlocked for the update or restore. Unlock your device and try again. Learn what to do if you forgot your passcode.
If you still see an error, contact Apple Support.
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Cellular Update Failed or Apple Pay Not Available alert
If you see either 'Cellular Update Failed' or 'Apple Pay requires an Update on this iPhone' alert after an update, learn what to do.
Check your security software
- If you see error 9, use these steps.
- If you see errors 2, 4, 6, or 1611, check your third-party security software. Then check your USB connection.
- If you still see an error, contact Apple Support.
Check your USB connections
If you see error 4005, 4013, or 4014, use these steps.
If you see one of the errors below, check your USB connection, USB cable, USB port, or computer:
- 13, 14, 1600, 1601, 1602, 1603, 1604, 1611, 1643–1650
- 2000, 2001, 2002, 2005, 2006, 2009
- An error that includes 'invalid response'
Here's what to check. Try again after each step:
- Use the USB cable that came with your device. If you don't have it, try a different Apple USB cable.
- Switch to a different USB port on your computer. Don't plug into your keyboard.
- Switch to a USB port on a different computer.
- If you still see the error, check for other USB issues, check your third-party security software, then check your hardware.
If you still see an error, contact Apple Support.
Check your hardware
If you see error 53, use these steps.
If you see one of the errors below, you might have a hardware issue:
- 1, 3, 10, 11, 12, 13, 14, 16
- 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 56
- 1002, 1004, 1011, 1012, 1014, 1667, 1669
Here's what to check. Try again after each step:
- If iTunes is already open, quit and reopen it.
- Check your third-party security software.
- Make sure that your USB cable, computer, and network are reliable. Then try twice more to restore your device.
- Check for outdated or modified software.
If you still see the error, contact Apple Support.
Check for outdated or modified software
If you see error 1015 or a message that 'the required resource can't be found,' your device might have unauthorized software modifications (jailbreaking). Or you might be trying to install an earlier version of iOS (downgrading).
To restore your device to the latest version of software, use recovery mode.
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If you still see an error, contact Apple Support.