您在 iPhone 或 iPad 上扫描系统软件更新时是否不断遇到“无法检查更新”弹出窗口？出现此错误消息的原因有多种，例如互联网连接不良、服务器端问题以及系统设置冲突。
幸运的是，您可以使用多种方法来修复此错误并使您的 iOS 或 iPadOS 设备保持最新状态。本故障排除指南将解释如何修复 Apple iPhone 和 iPad 上的“无法检查更新”错误。
启用和禁用飞行模式
解决 iPhone 或 iPad 与Apple服务器之间意外连接问题的快速方法是使用(Apple)飞行模式(Airplane Mode)重新启动Wi-Fi和蜂窝模块。只是：
- (Swipe)从屏幕右上角向下滑动以打开控制中心(Control Center)。
- 点击飞行模式(Airplane Mode)图标。如果 Wi-Fi 未关闭，请点击以手动禁用它。
- 等待(Wait)最多 10 秒钟，然后再次点击飞行模式(Airplane Mode)图标。
重新启动您的 iOS 设备
重新启动您的 iPhone(Restart your iPhone)或iPad以刷新设备并消除阻止其检查更新的小技术故障。重新启动任何 iOS 设备的最快方法是：
- 打开“设置”(Settings)应用程序，然后点击General > Shutdown。
- 关闭设备并等待 30 秒。
- 按住侧面(Side)按钮，直到出现
Apple徽标。(Apple)
检查苹果服务器
如果重新启动 iPhone 或 iPad 无法解决问题，下一步是检查 Apple 的系统状态。服务器(Server)中断可能会导致更新错误，因此值得验证是否存在已知问题。
打开 Safari 并访问 Apple 系统状态页面(visit the Apple System Status page)以检查可能的服务器端问题。如果多个服务出现故障，例如Apple ID、 iCloud帐户(Account)和登录(Sign)以及App Store。请(Wait)等到Apple解决这些问题后再重试。
检查您的网络连接
不稳定的互联网连接通常会导致iPhone 和 iPad 上的 iOS 系统更新问题(iOS system update problems on the iPhone and iPad)。使用Fast.com(Fast.com)等在线工具检查网络速度。如果速度看起来很慢，请尝试以下修复方法：
- 连接(Connect)到其他 Wi-Fi 网络，看看问题是否出在您当前的网络上。
- 使用移动数据来确定是否是(Use)Wi-Fi问题。
- 重新启动路由器以确保其正常运行。您还可以重置路由器(reset the router)来解决持续存在的问题。
- 检查您的 Wi-Fi 和蜂窝数据设置，并禁用低数据模式(Low Data Mode)（如果处于活动状态）。
- 停用低功耗模式(Low Power Mode)。
更改 DNS 服务器
公共DNS（域名系统）服务(public DNS (Domain Name System) service)（例如Google 公共 DNS）可以提高您的 iPhone 或 iPad 通过(Google Public DNS)Wi-Fi与 Apple 服务器通信的能力。要更改DNS服务器：
- 打开“设置”(Settings)应用程序并点击“Wi-Fi”。
- 点击Wi-Fi网络旁边的信息(Info)图标。
- 点击配置 DNS。
- 删除(Delete)现有的DNS条目并将其替换为以下内容：
- 点击保存。
强制重启 iPhone
如果您的 iPhone 或 iPad 仍然存在更新问题，则可能需要强制重启。它比常规重新启动更复杂，但往往可以解决顽固问题，因为它还会重新启动设备的固件。
如果您使用 iPhone 8、iPhone X 或更新机型，或者配备Face ID(Face ID)的 iPad ，请依次快速按下并释放音量增大和音量减小按钮；(Down)立即按住侧面(Side)按钮，直到看到Apple徽标。
在 iPhone 7 和 7 Plus上，按住音量调低(Down)按钮和侧面(Side)按钮，直到出现Apple徽标。(Apple)在 iPhone 6s 及更早版本或具有Touch ID(Touch ID)的 iPad 上，按住电源(Power)按钮和主屏幕(Home)按钮。
删除旧的更新文件
如果您在 iPhone 或 iPad 上继续遇到“无法检查更新”错误，可能是由于从之前的更新下载的系统软件部分损坏。删除有问题的文件可以解决问题并使您的设备能够搜索新更新。要做到这一点：
- 打开“设置”(Settings)应用程序，然后点击General > “iPhone 存储空间”。
- 搜索并点击软件更新(Software Update)。
- 点击删除更新。
在此过程中，检查 iPhone/iPad存储(Storage)屏幕顶部的存储空间指示器，并确保有足够的空间来更新 iOS 或 iPadOS。如果没有，请按照屏幕上的建议来释放 iPhone 或 iPad 上的空间(free up space on your iPhone or iPad)。
重置网络设置
解决 iPhone 或 iPad 更新问题的另一种可能方法是重置 iOS 网络设置(iOS network settings reset)。此过程可清除网络堆栈中可能导致连接问题并阻碍设备更新能力的任何损坏。
要重置网络设置：
- 打开“设置”(Settings)应用程序，然后转到General > Transfer或重置(Reset)iPhone”> “重置”(Reset)。
- 点击重置网络设置。
- 输入您的设备密码（如果出现提示，则输入屏幕时间密码(Screen Time passcode)），然后点击重置。
网络设置重置后，重新加入 Wi-Fi 网络或使用蜂窝数据检查更新。
重置所有设置
如果重置网络设置不起作用，请尝试将所有设备设置重置为默认值。这有点极端，但解决了因设置配置损坏而产生的问题。它不会导致数据丢失。
要重置所有设置：
- 打开“设置”(Settings)应用程序，然后转到General > Transfer或重置(Reset)iPhone”> “重置”(Reset)。
- 点击重置所有设置。
- 使用设备密码（以及屏幕时间(Screen Time)密码，如果出现提示）验证您的操作，然后点击重置(Reset)。
通过 PC/Mac 更新 iPhone/iPad
如果所有尝试检查OTA。（无线）iOS 更新失败，通过计算机将 iPhone 或 iPad 更新到最新版本可能是最佳选择。此方法可能很耗时，但应该可以帮助您绕过“无法检查更新”错误。要做到这一点：
- 通过USB将您的 iPhone 或 iPad 连接到 macOS 或Windows设备。
- 解锁(Unlock)您的 iPhone 或 iPad，然后点击“信任”(Trust)。
- 打开 iTunes（如果您使用运行 macOS Catalina或更高版本的(Catalina)Mac ，则打开 Finder ）。如果您的 PC 上没有 iTunes，您可以从Microsoft Store获取它。
- 在 iTunes 或Finder窗口中选择您的 iPhone 或 iPad。
- 选择“检查(Select Check)更新”(Updates)以扫描最新的 iOS 版本。如果有待处理的更新，请选择“更新”(Update)。
- 等待(Wait)您的计算机下载IPSW 格式的最新 iOS 副本(up-to-date copy of iOS in IPSW format)，并使用它来更新 iPhone/iPad 的系统软件。
或者，您可以通过将 iPhone(placing your iPhone)或iPad 置于恢复模式(iPad in Recovery Mode)来安装新的 iOS 更新。
让您的 iPhone/iPad 更新重回正轨
iPhone 或 iPad 上的“无法检查更新”错误相对容易解决。切换飞行模式和重新启动设备等(Airplane Mode)快速(Quick)修复可以快速解决问题。如果没有，请继续进行其他修复以使其消失。但是，如果上述方法均无效，请联系 Apple 支持(contact Apple Support)寻求帮助。
How to Fix “Unable to Check for Update” Error on iPhone/iPad
Do you keep running into an “Unable tо Chеck for Update” pop-up while scanning for system software updates on your iPhone or iPad? There are several reasons for this error message, such as poor internet connectivity, server-side problems, and conflicting system settings.
Luckily, you’ve got several methods you can work through to fix this error and get your iOS or iPadOS device up to date. This troubleshooting guide will explain how to fix the “Unable to Check for Update” error on Apple’s iPhone and iPad.
Enable and Disable Airplane Mode
A quick way to fix unexpected connectivity issues between your iPhone or iPad and the Apple servers is to reboot the Wi-Fi and cellular modules using Airplane Mode. Just:
- Swipe down from the top right of the screen to open the Control Center.
- Tap the Airplane Mode icon. If Wi-Fi doesn’t turn off, tap to disable it manually.
- Wait up to 10 seconds and tap the Airplane Mode icon again.
Restart Your iOS Device
Restart your iPhone or iPad to refresh the device and eliminate minor technical glitches preventing it from checking for updates. The quickest way to reboot any iOS device is to:
- Open the Settings app and tap General > Shutdown.
- Turn off the device and wait 30 seconds.
- Press and hold the Side button until the Apple logo shows up.
Check the Apple Servers
If restarting your iPhone or iPad doesn’t resolve the issue, the next step is to check Apple’s system status. Server outages can cause update errors, so it’s worth verifying if there are known problems.
Open Safari and visit the Apple System Status page to check for possible server-side issues. If multiple services appear down, such as Apple ID, iCloud Account & Sign In, and App Store. Wait until Apple resolves them before you try again.
Check Your Network Connection
An erratic internet connection often results in iOS system update problems on the iPhone and iPad. Use an online tool like Fast.com to check the network speed. If it appears slow, try the fixes below:
- Connect to a different Wi-Fi network to see if the issue is with your current network.
- Use mobile data to determine if it’s a problem with Wi-Fi.
- Restart your router to ensure it’s functioning correctly. You can also reset the router to resolve persistent issues.
- Check your Wi-Fi and cellular data settings and disable Low Data Mode if it’s active.
- Deactivate Low Power Mode.
Change the DNS Servers
A public DNS (Domain Name System) service like Google Public DNS can improve your iPhone or iPad’s ability to communicate with Apple’s servers over Wi-Fi. To change the DNS servers:
- Open the Settings app and tap Wi-Fi.
- Tap the Info icon next to the Wi-Fi network.
- Tap Configure DNS.
- Delete the existing DNS entries and replace them with the following:
- Tap Save.
Force-Restart iPhone
A force restart might be necessary if your iPhone or iPad still has update issues. It’s more complex than a regular restart but tends to resolve stubborn problems since it also reboots the device’s firmware.
If you use an iPhone 8, iPhone X, or later, or an iPad with Face ID, quickly press and release the Volume Up and Volume Down buttons one after the other; immediately follow by holding the Side button until you see the Apple logo.
On the iPhone 7 and 7 Plus, press and hold the Volume Down and Side buttons until the Apple logo appears. On the iPhone 6s and older or an iPad with Touch ID, press and hold the Power and Home buttons.
Delete Old Update Files
If you continue encountering the “Unable to Check for Update” error on your iPhone or iPad, it could be due to a partially corrupt system software download from a previous update. Deleting the problematic file could resolve the issue and enable your device to search for new updates. To do that:
- Open the Settings app and tap General > iPhone Storage.
- Search for and tap Software Update.
- Tap Delete Update.
While at it, check the storage space indicator at the top of the iPhone/iPad Storage screen and make sure there’s enough room to update iOS or iPadOS. If not, work through the on-screen recommendations to free up space on your iPhone or iPad.
Reset Network Settings
Another potential way to fix iPhone or iPad update issues is an iOS network settings reset. This process clears out any corruption within the networking stack that may be causing connectivity problems and hindering your device’s ability to update.
To reset network settings:
- Open the Settings app and go to General > Transfer or Reset iPhone > Reset.
- Tap Reset Network Settings.
- Enter your device passcode (and Screen Time passcode if prompted) and tap Reset.
After the network settings reset, rejoin a Wi-Fi network or use cellular data to check for updates.
Reset All Settings
If a network settings reset doesn’t help, try resetting all device settings to their default values. It’s a little extreme but resolves problems that stem from a broken settings configuration. It does not cause data loss.
To reset all settings:
- Open the Settings app and go to General > Transfer or Reset iPhone > Reset.
- Tap Reset All Settings.
- Authenticate your action with your device passcode (and the Screen Time passcode if prompted) and tap Reset.
Update iPhone/iPad via PC/Mac
If all attempts at checking for O.T.A. (over-the-air) iOS updates fail, updating your iPhone or iPad to its latest version via a computer might be the best option. This method can be time-consuming but should help you bypass the “Unable to Check for Update” error. To do that:
- Connect your iPhone or iPad to a macOS or Windows device via USB.
- Unlock your iPhone or iPad and tap Trust.
- Open iTunes (or Finder if you use a Mac running macOS Catalina or later). If you don’t have iTunes on your PC, you can get it from the Microsoft Store.
- Select your iPhone or iPad on the iTunes or Finder window.
- Select Check for Updates to scan for the latest iOS version. If there’s a pending update, select Update.
- Wait until your computer downloads an up-to-date copy of iOS in IPSW format and uses that to update your iPhone/iPad’s system software.
Alternatively, you can install new iOS updates by placing your iPhone or iPad in Recovery Mode.
Get Your iPhone/iPad Updates Back on Track
The “Unable to Check for Update” error on an iPhone or iPad is relatively easy to troubleshoot. Quick fixes like toggling Airplane Mode and restarting the device can take care of it quickly. If not, continue working through the other fixes to make it go away. However, if none of the above methods work, contact Apple Support for assistance.
