出于安全原因以及那些讨厌的错误，让您的 iPhone 保持最新的 iOS 版本总是一个好主意。然而，有时您的 iPhone 就是无法与时俱进，也不会更新。
发生这种情况的原因有多种，从可以轻松立即修复的问题到您必须休息一个下午才能进行一些认真的故障排除的问题。
1. 检查更新服务器状态(Update Server Status)和电话资格(Phone Eligibility)
随着 iOS 的重大更新，苹果的服务器在发布后不久就不堪重负，这并不罕见。基本上(Basically)，每个人都在尝试首先下载闪亮的新操作系统，而有些人则被暂时拒绝。
如果更新时间没有什么特别的，您应该前往Apple 系统状态页面(Apple System Status page)。您将在此处看到有关 Apple 已知的服务器问题的任何通知。
2. 打开和关闭飞行模式
有时，iOS 中的网络功能似乎会无缘无故地消失。让数据再次流动的最快方法通常是打开然后再次关闭飞行模式。(Airplane)如果您从屏幕右上角向下滑动以显示“控制中心”(Control Center)，它是一个带有飞机图片的按钮。
不要使用Wi-Fi开关，因为这实际上不会关闭Wi-Fi模块，而是会断开您与所有Wi-Fi网络的连接，直到第二天。
3. 重新启动你的iPhone
与大多数技术问题一样，您应该做的第一件事就是重新启动 iPhone，以防问题只是暂时的故障。
在没有“主页”(Home)按钮的 iPhone 上，按住“侧面”(Side)按钮和“音量 +”按钮，直到看到“滑动即可关闭”。在带有物理主页(Home)按钮的 iPhone 上，按住电源按钮，直到看到相同的消息。关闭手机后，按住侧面(Side)按钮或电源(Power)按钮，直到看到Apple徽标出现。
4. 确保您的手机已插入电源并已充电(Charged)
由于更新过程中的电源中断可能会导致您的手机变砖，因此如果您的 iPhone 剩余电量低于 50%，则不会继续进行更新。如果您已安排更新，则手机也必须正在充电，否则无论电池电量如何，您的 iPhone 都会跳过更新。
虽然将手机放在无线充电板上可以进行夜间更新，但根据我们的经验，任何电源中断都可能导致手机无法重新充电。因此，如果您想要夜间自动更新，使用电缆充电更好、更可靠。
5. 检查网络连接
您的 iPhone 需要有稳定且合适的互联网连接才能下载和安装更新。以下是您需要检查的关键事项：
- 您使用 Wi-Fi 吗？
- 您的 Wi-Fi 信号强度好吗？
- 是路由器吗？重新启动它只是为了确定。
- 你的连接速度够快吗？在您的 iPhone 上运行速度测试来确定。
- 您(Are)使用VPN吗？暂时禁用(Disable)您的VPN以完成更新。
如果您的网络连接正常并且您已检查了上面列出的所有内容，我们可以继续解决下一个可能的问题原因。
6.重置您的网络连接
如果您的网络设置已损坏或无法正常工作，您可以重置它们。这不会影响您 iPhone 上的任何其他内容，但请注意，您必须为已保存的每个网络重新输入 Wi-Fi 密码。
前往Settings App > General > Transfer或重置(Reset)iPhone ” > Reset，然后选择“重置网络设置”(Reset Network Settings)。
7. 确保足够的存储空间
要下载并安装软件更新，您的 iPhone 需要足够的可用空间。您通常会收到一条警告，指出没有足够的存储空间来下载和安装更新，在这种情况下，您可以采取一些措施来释放一些空间：
- Settings > General > “iPhone 存储”下有多少可用空间，以确定需要释放多少空间。
- 删除(Delete)或卸载您不需要或可以在更新完成后重新下载的应用程序。
- 清除应用程序缓存。某些应用程序（例如Netflix）的缓存中可能存储了大量数据。Settings > General > “iPhone 存储”下安全地删除此数据，其中每个应用程序的数据将按大小列出。
- 前往Settings > Apple ID > “iCloud” > Photos，并确保选择“优化手机存储” 。(Optimize Phone Storage)这会将照片的高质量版本移动到云端，并且只在手机上留下预览。
如果您没有时间手动释放 iPhone 上的空间，还有一些专门的应用程序可以帮助您快速释放 iPhone 上的空间。(specialized apps)如果您愿意使用移动数据进行更新，请参阅我们的指南，了解如何在没有 Wi-Fi 的情况下更新 iPhone(how to update an iPhone without Wi-Fi)。
8. 通过 iTunes 或 Finder 更新 iOS
如果您的 iPhone 无法直接在设备上更新，您可以尝试使用 iTunes（适用于Windows或 macOS Mojave及更早版本）或Finder（适用于 macOS Catalina及更高版本）进行更新。这可以帮助绕过您在无线更新时可能遇到的问题。
在 iTunes 中，您只需在手机出现在应用程序中后选择您的手机，然后选择“检查(Check)更新”(Update)。
在Finder中，将手机插入Mac后，该手机就会出现在“位置”(Locations)下。选择它，然后在“常规”(General)选项卡下查找“检查(Check)更新”(Update)。
9. 删除并重新安装更新
如果下载的更新出现问题并且在更新验证阶段未自动更正，您实际上可以删除待处理的更新数据并重新开始。
前往Settings > General > “iPhone 存储”，然后在已安装的应用程序列表中找到 iOS 更新。然后选择它并使用删除更新(Delete Update)将其删除。完成后，重新启动手机并尝试使用新下载再次更新。
10.删除所有越狱
如果您的 iPhone 已越狱，这可能会干扰正常更新。通常，在越狱的创建者验证更新不会关闭他们用来解锁手机的漏洞后，越狱设备会从第三方来源获取更新。
如果您从其他人那里收到手机（例如通过二手购买），您可能不知道该设备已越狱。无论哪种方式，要撤消越狱，您都必须通过执行全新安装(clean install)将 iPhone 恢复到官方批准的状态。
在全新安装过程中，无论如何，您都会获得最新版本的 iOS，除非您的手机出现其他问题，否则它将继续正常更新。
11.强制重启(Force Restart)或使用恢复模式(Use Recovery Mode)
如果您的问题是更新已启动但失败，则需要恢复模式。这通常表现为启动循环，您只是反复看到Apple徽标，但手机从未启动。
从恢复模式菜单中，您可以恢复或更新您的 iPhone，选择权在您手中。通过选择更新选项，您将保留手机上的现有内容和设置，因此这通常是最明智的选择。
要获取有关如何强制重新启动手机然后将其启动到恢复模式(Recovery Mode)的详细说明，请查看我们简单的恢复模式指南(Recovery Mode guide)。
12.修复DFU模式下的更新错误(DFU Mode)
如果到目前为止您所做的一切都无法帮助您更新 iPhone，那么是时候认真一点了。您的 iPhone 有一种特殊模式，称为DFU或设备固件模式(Device Firmware Mode)。这实质上是用新的出厂映像刷新您的 iPhone，从而完全擦除手机上当前的内容。
不用说，手机上任何没有备份的数据都会丢失，但此时如果没有其他方法起作用的话，你的数据无论如何都会丢失。但是，如果您使用DFU模式更新您仍然可以访问的手机，请花点时间确保所有内容都备份到 iCloud 或您选择的任何其他备份位置。
如果这是您想要的方式，请参阅我们的iPad 和 iPhone DFU 模式指南(iPad and iPhone DFU Mode Guide)。
13. 前往Apple Store 零售店(Apple Store)寻求帮助(Assistance)
如果上述步骤均无法修复您的 iPhone，那么剩下的选择就是将其送至Apple Store 零售店(Apple Store)进行评估。他们甚至可以为您恢复或刷新手机的固件。他们还可以在您的手机上运行诊断测试，以检查其硬件是否存在任何问题，并从那里为您提供建议。
iPhone Won’t Update? 13 Ways to Fix
It’s alwaуs a good ideа to keep your iPhоne up to date with the latest iOS version for security reasons as well as those pesky bugs. However, sometimeѕ your iPhone just won’t get with the times, and won’t update.
There are a few different reasons why this might be happening, ranging from things that can be fixed easily and immediately, to those you’ll have to take an afternoon off for so you can do some serious troubleshooting.
1. Checking the Update Server Status and Phone Eligibility
With major new iOS updates, it’s not unusual for Apple’s servers to be overwhelmed in the period shortly following its release. Basically, everyone is trying to download the shiny new operating system first, and some people are being turned away temporarily.
If there’s nothing special about the timing of your update, you should head over to the Apple System Status page. Here you’ll see any notifications about server problems that Apple’s aware of.
2. Toggle AirPlane Mode On and Off
Sometimes network functions in iOS seem to die for no apparent reason. The fastest way to get your data flowing again is usually to toggle Airplane mode on and then off again. If you swipe down from the top-right of the screen to reveal the Control Center, it’s the button with a picture of a plane on it.
Don’t use the Wi-Fi toggle, since this doesn’t actually turn the Wi-Fi module off, but rather disconnects you from all Wi-Fi networks until the next day.
3. Restarting Your iPhone
As with most technology problems, the first thing you should do is reboot your iPhone in case the issue is just a temporary glitch.
On an iPhone without a Home button, press and hold the Side button and Volume + button until you see Slide to turn off. On an iPhone with a physical Home button, hold the power button until you see the same message. After turning the phone off, press and hold the Side or Power button until you see the Apple logo appear.
4. Make Sure Your Phone Is Plugged In and Charged
Because a power interruption during an update could potentially brick your phone, your iPhone won’t go ahead with an update if there’s less than 50% battery remaining. If you’ve scheduled the update, the phone must also be charging, or your iPhone will skip the update regardless of battery level.
While putting your phone on a wireless charging pad will work for overnight updates, in our experience any disruption of the power will result in the phone potentially not restarting its charge. So it’s better and more reliable to use cable charging if you want an auto update overnight.
5. Checking Your Network Connection
Your iPhone needs to have a stable and suitable internet connection to download and install updates. Here are the key things you need to check:
- Are you using Wi-Fi?
- Is your Wi-Fi strength good?
- Is it the router? Restart it just to be sure.
- Is your connection fast enough? Run a speed test on your iPhone to make sure.
- Are you using a VPN? Disable your VPN temporarily to complete the update.
If your network connection is fine and you’ve checked off all the things listed above, we can move on to the next likely cause of the issue.
6. Reset Your Network Connection
If your network settings have become corrupted or otherwise aren’t working correctly any more, you can reset them. This won’t affect anything else on your iPhone, but do be warned that you’ll have to re-enter the Wi-Fi passwords for every network you have saved.
Go to Settings App > General > Transfer or Reset iPhone > Reset and then select Reset Network Settings.
7. Ensuring Enough Storage Space
To download and install a software update, your iPhone needs enough free space. You’ll usually get a warning that there’s not enough storage to download and install the update, in which case there are a few things you can do to free up some room:
- Check how much free space you have under Settings > General > iPhone Storage to determine how much you need to free up.
- Delete or offload apps you don’t need or can re-download after the update is complete.
- Clear app caches. Some apps, such as Netflix, may have large amounts of data stored in their cache. You can safely remove this data under Settings > General > iPhone Storage, where each individual app’s data will be listed by size.
- Go to Settings > Apple ID > iCloud > Photos and make sure Optimize Phone Storage is selected. This will move the high-quality versions of photos to the cloud and only leave a preview on your phone.
There are also several specialized apps that can help you free up space on your iPhone quickly if you don’t have time to do it manually. If you’re willing to use mobile data for the update, head over to our guide on how to update an iPhone without Wi-Fi.
8. Updating iOS via iTunes or Finder
If your iPhone won’t update directly on the device, you can try updating it using iTunes (for Windows or macOS Mojave and earlier) or Finder (for macOS Catalina and later). This can help bypass issues you might be experiencing with over-the-air updates.
In iTunes, you only have to select your phone once it appears in the app, and then select Check for Update.
In Finder, the phone will appear under Locations once you plug it into your Mac. Select it and then look for Check for Update under the General tab.
9. Deleting and Reinstalling the Update
In case something goes wrong with the downloaded update and it’s not automatically corrected during the update verification phase, you can actually delete the pending update data and start again.
Go to Settings > General > iPhone Storage and then find the iOS update in the list of installed apps. Then select it and use Delete Update to remove it. Once that’s done, restart your phone and try to update again with a fresh download.
10. Remove Any Jailbreaks
If your iPhone is jailbroken, this is likely to interfere with normal updates. Usually, jailbroken devices get their updates from a third-party source after the creators of the jailbreak have verified that the update doesn’t close the exploit they’re using to unlock the phone.
If you’ve received your phone from someone else, such as through a second-hand purchase, you may not be aware that the device is jailbroken. Either way, to undo a jailbreak, you’ll have to restore the iPhone to its officially-sanctioned state by performing a clean install.
During the clean install process, you’ll get the latest version of iOS anyway, and unless something else is wrong with your phone, it will continue to update as normal going ahead.
11. Force Restart or Use Recovery Mode
If your problem is that the update started but failed, you need recovery mode. This usually manifests as a boot loop where you just repeatedly see the Apple logo, but the phone never starts up.
From the recovery mode menu you can either restore or update your iPhone, the choice is yours. By choosing the update option, you’ll preserve existing content and settings on the phone, so it’s generally the most sensible option to go for.
To get detailed instructions on how to force restart your phone and then boot it into Recovery Mode, check out our simple Recovery Mode guide.
12. Fixing Update Errors With DFU Mode
If nothing you’ve done so far has helped you update your iPhone, it’s time to get a little more serious. Your iPhone has a special mode known as DFU or Device Firmware Mode. This is essentially flashing your iPhone with a new factory image, completely erasing what’s currently on the phone.
Needless to say, any data on the phone that hasn’t been backed up will be lost, but at this point your data is lost anyway if no other method has worked. However, if you’re using DFU mode to update a phone that you still have access to, take the time to make sure everything is backed up to iCloud or any other backup location of your choice.
If this is the way you want to go, head over to our iPad and iPhone DFU Mode Guide.
13. Visiting an Apple Store for Assistance
If none of the steps above let you fix your iphone, then the remaining option is to take it in for assessment at an Apple Store. They may even be able to restore or flash the phone’s firmware for you. They can also run diagnostic tests on your phone to check if there’s anything wrong with its hardware and advise you from there.
