Compilation of iOS 11 Update Errors on iPhone, iPad + FIXES

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Ngày cập nhật gần nhất: 15/4/2026

Many have reported issues when upgrading, updating iOS 11 on iPhone, iPad. To help you troubleshoot, fix errors when updating iOS 11 on iPhone, iPad, Mytour.vn has compiled common problems during this iOS Update process as well as how to fix iOS 11 update errors for iPhone, iPad.

The iOS 11 update for iPhone, iPad has attracted considerable attention and has also been updated and guided through the article on how to update iOS 11 for iPhone, iPad earlier, however, during the upgrade process, many encountered errors when updating iOS 11 on iPhone, iPad, causing the update process to be interrupted and affecting device usage.

causing the update process to be interrupted and affecting device usage.

Guide to fixing iOS 11 update errors on iPhone, iPad

We often encounter the following errors when updating iOS 11 on iPhone, iPad:

1. Slow iOS Update Error

Many users complain that the process of updating iOS 11 on their iPhone, iPad is extremely slow during the download and installation of the upgrade, iOS 11 update to the device.

Resolution :

To resolve the slow iOS 11 update error on iPhone, iPad, you should try changing the Wifi connection on your iPhone, iPad and avoid downloading this update using 3G, 4G connection on iPhone, iPad.

2. iOS 11 Update Error Power Failure

Cause: When you perform the iOS 11 upgrade, power failure usually starts when you update iOS 11 for iPhone via OTA but the battery level on the device is low and not enough to complete its data loading process.

How to fix it:

To fix the issue when updating iOS 11 on iPhone, iPad without power failure, you need to put your device in DFU mode and perform Restore iPhone. For the steps to restore iPhone, refer to how to restore iPhone, iPad, which has been sent to you by Mytour.vn in previous articles to rescue your device.

3. Computer doesn't recognize iPhone for iOS 11 update via iTunes

There are various reasons why the iPhone device is not successfully recognized by iTunes on the computer, but there's no need to worry to resolve this.

How to fix it:

- Please check the device connection system between iPhone and computer such as connection cables, connection ports.

- Confirm the trustworthiness after connecting iPhone to the computer on the device screen.

- If iTunes doesn't recognize iPhone, you should refer to the guide on itunes doesn't recognize iPhone to quickly fix this issue.

4. Error occurs during iOS 11 update via iTunes

This is quite common for those who are new to updating iOS 11 via iTunes.

How to fix it:

- You need to download and install the latest version of iTunes tool for your computer here: Download iTunes.

5. Error Verifying Update iOS 11 during update, Update

This error often occurs when the new iOS 11 version is released and you want to check the device upgrade version. Part of the reason is the data connection process from the device to the iOS 11 update registration system has encountered an issue.

How to fix it:

+ To fix this, try checking the accessibility, Internet connection from 3G or Wifi connection on your device.

+ Additionally, you can also choose to restart your iPhone to resolve this.

6. iPhone 5, 5c unable to find iOS 11 update version

Unlike the errors listed above, the error of iPhone 5, 5c unable to find iOS 11 update version when you upgrade iOS 11 update for the device is known to be caused by the fact that this device does not support the update, leading to update errors on iPhone 5, 5s.

To check which iPhone, iPad models are updated to iOS 11, you can refer to the list of iPhone models updated to iOS 11 previously updated by Mytour.vn.

7. Error losing automatic brightness adjustment feature

If users were accustomed to using the automatic brightness feature based on the usage environment before, they will surely encounter trouble when we cannot use this feature. However, this feature hasn't been lost but has been moved to another area.

How to fix it:

Step 1: You access the Settings app from the device's home screen. Here we select the General Settings.

Here you continue to access the Accessibility section to search for the automatic brightness adjustment feature on iPhone iOS 11.

Step 2: Next, we select the Display Accommodations feature.

And you will see the Auto-Brightness feature has been moved here. You can choose to enable or disable this feature.

8. iOS 11 battery draining after update

This is not a new issue after each new iOS update is released for each device. Although updating iOS 11 brings great experiences when you use it, you will quickly feel your device draining battery. Especially for devices updated to iOS 11 via OTA.

How to fix it:

According to the information gathered by Mytour.vn about battery draining issue after updating to iOS 11, most of these issues will occur with devices performing iOS 11 upgrades via OTA. To address this, users can choose to update iOS 11 via iTunes, which is one of the temporary measures that you can apply at the moment. Mytour.vn will continuously update additional ways to fix the battery draining issue after updating to iOS 11.

9. Call sound issue on iPhone 8, 8 Plus

With the recently released iPhone 8, 8 Plus devices, users easily notice the difficulty in making calls on this device and often encounter call sound issues.

How to fix it:

With the call sound issue on iPhone 8, 8 Plus just appeared, Apple quickly released iOS 11.0.2 update for users to download, update for the device as well as thoroughly fix the call sound issue on iPhone 8, 8 Plus.

10. Touch issue on iPhone 6s

Despite undergoing various bug fix updates on iOS 11, the touch response issue on iPhone 6s resurfaces, leaving many users unable to operate or use their phones as desired. This is especially true for those who own a second-hand iPhone 6s.

How to fix it:

When the touch issue on iPhone 6s appears after updating to iOS 11 and iOS 11.0.1 recently, Apple experts affirm that: The touch issue on iPhone 6s stems from the use of non-genuine Apple components. Non-genuine replacement screens may affect image quality, causing inaccurate display. Repairing Apple screens must be performed by trustworthy experts using genuine Apple components.

11. Sound and vibration feedback not working on iPhone 7 issue

The sound vibration issue on iPhone 7 is also a concern for many users after successfully updating to iOS 11, their device suddenly experiences sound or vibration issues on iPhone 7.

How to fix it:

According to Apple, we can easily fix the sound and vibration feedback not working issue on this iPhone 7 by performing the iOS 11.0.3 update. You can access the Settings app, select General, and choose Software Update to update iOS 11.0.3 for your iPhone 7.

So we've just summarized the ways to fix iOS 11 update issues on iPhone, iPad commonly seen today to help you quickly complete the upgrading process, update iOS 11 for your device.

https://Mytour.vn/cach-sua-loi-khi-cap-nhat-ios-11-tren-iphone-ipad-19133n.aspx
If you're still unsure whether to upgrade to iOS 11 for your iPhone, iPad, you can refer to the discussion article should I upgrade to iOS 11 for iPhone, iPad? to better understand the eagerly awaited and beloved iOS 11 version.

Frequently Asked Questions

What should I do if my iPhone update to iOS 11 is very slow?

If your iPhone update to iOS 11 is very slow, it is advisable to switch your device's Wifi connection instead of using a 3G or 4G connection. This can significantly enhance the speed of downloading and installing the update.

How can I resolve power failure during iOS 11 upgrade on my iPad?

To resolve power failure during the iOS 11 upgrade on your iPad, you should first ensure your device is sufficiently charged. If power fails during the update, put the device in DFU mode and perform a restore to complete the upgrade.

What can I do if my iTunes doesn’t recognize my iPhone during the update?

If iTunes doesn’t recognize your iPhone during the update, check the connection between the iPhone and the computer. Ensure the cable is secure and that you have confirmed the trust prompt on your device’s screen.

Is there a way to fix the 'Error Verifying Update' issue on iOS 11?

Yes, to fix the 'Error Verifying Update' issue on iOS 11, check your internet connection to ensure it is stable. Restarting your iPhone can also help resolve this issue effectively.

Why can’t I find the iOS 11 update for my iPhone 5 or 5c?

The iOS 11 update is not available for iPhone 5 and 5c because these devices do not support the update. You may check the list of compatible iPhone models to see which devices can upgrade to iOS 11.

How do I restore the automatic brightness feature on my iPhone after updating to iOS 11?

To restore the automatic brightness feature after updating to iOS 11, go to the Settings app, select General, then Accessibility, and finally Display Accommodations. You can find the Auto-Brightness option there to enable it.

What steps should I take if my iPhone 7 experiences sound issues after updating?

If your iPhone 7 experiences sound issues after updating, perform the iOS 11.0.3 update. Go to Settings, select General, and then Software Update to install the latest version, which should resolve sound problems.

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