If you have a Mac with macOS Mojave 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. Choose your error number or message To learn what to do, choose your error:. You might need to unlock your iOS device before it is recognized by your Mac. When you see a message that says a software update is required to connect to your iOS device , click Install to download and install the software so your Mac can update or restore your iOS device.
Make sure that your device can communicate with Apple servers If you see error , your computer is downloading necessary software. 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, , , , , , , , , , , "There was a problem downloading the software. Check your third-party security software.
Check your security software If you see error 9, use these steps. If you see errors 2, 4, 6, or , check your third-party security software.
Then check your USB connection. Check your USB connections If you see error , , or , use these steps. If you see one of the errors below, check your USB connection, USB cable, USB port, or computer: 13, , , , , , , — , , , , , 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. This article will bring a light on this matter and will offer some solutions to resolve the issue.
In other words, when you get errors while updating to the newest iOS, it can be a hint that your devices storage is not sufficient for the process completion. Since the upgrading process really takes some space, if you're not having enough space, you will end up with incomplete and erroneous update issue.
It says to remove the downloaded firmware and then try to upgrade to iOS version again. There steps go like this:. Not only storage is the culprit. Therefore, make sure to check it and switch to the stable Wi-Fi connection when experiencing such issue. You can try with another iPhone, or reset network settings if the other iPhone works fine.
Believe it or not, forcing restart the device is always a sensible step when your iPhone stuck with such issues. The steps for different devices are as follows:. You need to press the 'Volume Up' button and release it quickly.
Subsequently, repeat the same with the 'Volume Down' button as well. There are two ways to do that effectively: Using settings Step 1: Open the Settings on your device.
Step 3: Toggle the switch next to Wi-Fi to turn it off. Wait a few seconds and the tap on the switch to turn it back on. Doing this will disable all connections on the device including Wi-Fi. Step 3: While Airplane mode is still turned on, restart the device. Step 5: Turn off Airplane mode. Follow these simple steps to do it: Step 1: Open the Settings. You may be promoted to enter the passcode to confirm that you would like to reset the network settings.
Step 4: Confirm that you would like to reset all settings on the device. When the device restarts, re-connect to your network and try to update the device again. Manually install iOS 15 update through iTunes If all attempts to update the device via settings fails, you can always try to update it via iTunes. Step 3: When the iPhone appears in iTunes, click on it to select it. Step 2: You should see the Update here. Tap on it to select it.
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