Encounter some problems when updating iPhone iPad iPod touch to iOS 11? Quickly grab this post to find the corresponding iOS 11 issue, and learn about its possible solutions.
Download PhoneRescue now to restore lost iOS data easily from iOS devices directly, because of iOS 11 updating. Besides, it also supports retrieving data from iTunes and iCloud backups.
A few months after iOS 11 announced at WWDC 2017, now this biggest iOS upgrading this season has finally arrived, on 19th September. At this moment, if you would like to enjoy the newest iOS version features, you can also download it and upgrade your iPhone iPad iPod to iOS 11.
Although we all know that every newer iOS version will not only bring fresh features to make our life more funny, but also update fixes for bugs occurring in the previous versions. However, this does not mean iOS 11 is perfect, and bugless. According to our data collection from many mainstream and non-mainstream forums, and our user’s emails and feedback, many iOS 11 problems and issues occur during iOS 11 updating, and using it afterwards. So to help all iOS 11 users solve these annoying troubles, we list them one by one, with quick and practical solutions, in the following.
“Software Update Failed. An error occurred downloading iOS 11”, or “Software Update Failed. An error occurred installing iOS 11” issue is kind of universal. And every time iOS updating, this serial problems always exist. To fix it, you can try:
iOS 11 Problems - Software Update Failed
Tip 1. Check if your devices support iOS 11, because Apple would leave some old devices behind when newest iOS generation coming. For example, you can’t upgrade iPhone 5 to iOS 11. To make sure whether your iPhone iPad iPod is on the list or not, please visit here
Tip 2. Reset Network Settings. Go to Settings > General > Reset > Tap on Reset Network Settings.
Tip 3. Force a Restart on Your Device. Press and hold both the power button and the Home buttons and continue holding until the Apple logo appears.
Tip 4. Turn Off Wi-Fi and Switch to the Cellular Data.
Tip 5. Apply iTunes to update iOS 11 on computer.
For more details to work around these software update failed, unable to upgrade, and an error occurred installing iOS 11, refer to this guide post: How to Fix An Error Occurred Installing iOS 11 >
After downloading iOS 11 updating files, there will be a verifying update step. But sometimes iDevices would be stuck on this verifying update screen, or even notice unable to verify update.
iOS 11 Problems - Verifying Update Issue
Method 1. Make sure your network be connected all the time.
Method 2. Hard reset or reboot you device.
Method 3. Update iOS 11 with iTunes on computer.
View the details of each step to fix verifying update issue, please refer to this guide: How to Fix iPhone Stuck on Verifying Update >
iOS 11 Problems - Insufficient Space For Download
This iOS 11 issue happens more commonly on those devices with 16G, or 32G storage. The most direct solution is to transfer our data and files from iPhone iPad iPod to another iOS device.
Normally we can use iTunes to back up our devices. But we also know iTunes aims at backing up all data. So if the amount of your photos, videos, music, or others, are extremely large, it would be costing much time. So we recommend an iTunes alternative - AnyTrans to selectively transfer data and make room for iOS 11 updating.
Surely, you can also refer to this tutorial to clean up space: How to Clean up iPhone iPad iPod for iOS 11 updating >
Almost every time new iOS updating, users would complaint about the newest iOS consumes power largely and fast. iOS 11 is not an exception, either.
iOS 11 Problems - Battery Fast Draining
Tip 1. Restart Your Device. Hold down the power button, slide to turn it off. Power it back on.
Tip 2. Disable Widgets. Swipe to the right while you’re on your device’s home screen. Scroll all the way to bottom of your widgets and select Edit. To deactivate a widget, tap the red circle with the white line and tap Remove.
Tip 3. Use Low Power Mode. To enable Low Power Mode on your device head into Settings > Battery > Low Power Mode > and toggle it On whenever you need it.
Tip 4. Disable Raise to Wake. To shut off Raise to Wake, go into the Settings app > Display & Brightness and toggle the Raise to Wake function off.
Tip 5. Turn off Background App Refresh. Go to Settings > General > Background App Refresh > Turn it off then.
Tip 6. Reset All Settings. Go to Settings > General > Reset > Reset All Settings > Enter your passcode.
For more iOS batter related issues, here is a practical post for you: How to Solve Common Battery Issues on iOS 11/iOS 10 Devices >
After upgrading iOS 11, device maybe encounter not recognizing USB, and charging slowly, or even not charging at all.
iOS 11 Problems - Charging Issue
Solution 1. Use an Apple-matched USB cable, and don't use any cheap low quality cables.
Solution 2. Check and make sure your USB cables is not damaged.
Solution 3. Try hard resetting your iPhone or iPad.
Solution 4. Change a USB cable if you have one.
Solution 5. Use an iPad Charger will make it faster to charge iPhone.
View these solutions in details, please check the full guide: How to Fix: iPhone iPad Not Charging or Charging Slowly >
iOS 11 Problems - Overheating Issue
Some users reported that their iPhone iPad iPod were faced with temperature too high warning - “iPhone iPad iPod needs to cool down before you can use it.” during updating.
Solution 1. The easiest way is wait for a while until the device cools down itself. Also, you can choose to reset it or turn it off and try downloading the update again.
Solution 2. Take off the device case. Obvious enough, but this will help indeed.
Solution 3. Turn off Location Services. GPS is one item that heats up the iPhone iPad iPod the most. Turn it off using Settings > Privacy > Location Services > Off.
You can also follow this guide: Why Does My iPhone Get Hot and How to Fix It to get more.
If you find your cellular data is strangely slow, or even not working, after updating to iOS 11, you can try the following means.
iOS 11 Problems - Cellular Data Issues
Step 1. Check with your carrier to determine if there is an outage in your area.
Step 2. Restart your device. Hold down the power button, swipe to turn it off, hold the button down again to power back on.
Step 3. Check for a carrier update. Go to Settings > About, if you’re still experiencing this problem.
Step 4. Turn cellular data off, after a few seconds, toggle it on.
Step 5. Enable Airplane mode. Go to Control Center > Turn on Airplane Mode > Turn it off in about 30 seconds.
Step 6. Reset Network Settings. Head into Settings > General > Reset > Reset Network Settings.
Want more details about these steps? Refer to this tutorial: How to Fix: Cellular Data Not Working >
iOS 11 updating sometimes also leads to the abnormal state of Wi-Fi, such as iPhone iPad iPod cannot connect to Wi-Fi, Wi-Fi keeps dropping, Wi-Fi becomes grey, Wi-Fi automatically turns on, or won’t turn on, Wi-Fi is very slow, etc. However here are several quick tips to fix them.
iOS 11 Issues - Wi-Fi Problems
Solution 1. Make sure it’s not a router/Internet Service Provider (ISP) problem. You can try unplugging your router for like 5 minutes, and then restart it and test again.
Solution 2. Reconnect the Wi-Fi. If you’re pretty sure it’s not a router issue, you’ll go to Settings > Wi-Fi > Select your connection > and Tap Forget this Network at the top of the screen > Reconnect if you can and check for problems.
Solution 3. Reset Network Settings. Head into Settings > General > Reset > Reset Network Settings.
We also prepare a Wi-Fi issue topic page for you to figure them out, please refer to this full tutorial: How to Fix: iPhone iPad Not Connecting to Wi-Fi >
Just like Wi-Fi problems, iOS 11 updating may also put in such situations, Bluetooth won't connect to iPhone/Car, Bluetooth connection drops frequently, Bluetooth always on, or Bluetooth won't turn on on iPhone or iPad, etc. Possible solutions:
iOS 11 Issues - Bluetooth Problems
1. Reconnect Bluetooth. Settings > Bluetooth > Tap on the blue i in the circle next to the Bluetooth connection giving you problems > Tap Forget This Device > Try reconnecting.
2. Reset Network Settings. If the 1st quick fix doesn’t work well, try resetting your device’s network settings. Settings > General > Reset > Reset Network Settings. This process will take a few seconds to complete and your device will forget known Bluetooth devices.
3. Reset All Settings. Settings > General > Reset > Reset All Settings. Please note that this will revert your settings to factory defaults.
4. If you’re dealing with iOS 11 Bluetooth problems in a car, try these fixes but you also might need to consult your car’s manual and/or your car’s dealer for a potential fix.
Read this guide to get more solutions to fix iOS 11/iOS 10 Bluetooth Issues >
Occasionally, on iOS 11, the lock screen shows not the set lock screen wallpaper, but the home screen wallpaper. To fix this problem is pretty easy. You just need to restart your iPhone iPad, the lock screen wallpaper would return to normal.
iOS 11 Problems - Charging Issue
Like wallpaper, there is also another tiny iOS 11 problem - AirPods. Sometimes, AirPods cannot connect to iPhone iPad iPod. To fix it, take both AirPods off > Put them both inside the case > Close the case, and wait for 5-10 seconds > Take them out with the case next to phone.
Or, you can visit this guide of ours, finding more solutions to AirPods not connecting to iPhone iPad: How to Fix AirPods Won't Connect to iPhone/iPad >
After talking about AirPods, sound problems must be the next one of iOS 11 issues. If your device sound suddenly cuts out while you’re on the home screen or while you’re using an application, don’t panic. You should be able to fix the issue in seconds.
1. Restart iPhone iPad iPod. Hold down the power button, slide to turn off, power the device back on and check.
2. Toggle Bluetooth off and on to see if it fixes your issue.
3. If these sound problems happens to a specific app, make sure it is the latest version.
4. Take a notice of your speaker grille to make sure debris isn’t causing the issue. If you notice something, carefully remove it to see if that improves your device’s sound.
If you are looking for ways to solve issues related to text sound, you can refer to this post for suggestions: How to Fix No Text Sound on iPhone >
The other iOS 11 sound related problem is about iPhone ringtone. Many users have emailed us asking for help with ringtonw not working on iPhone, so we gather a few possible solutions:
Method 1. Go to Settings > Sounds to adjust the volume of ringtone.
Method 2. Make sure you have "mute" button set to ring instead of silent.
Method 3. Restart your iPhone.
Method 4. Contact Apple.
For the details of each method, please follow this guide: How to Fix iPhone Ringtone Not Working >
On iOS 11, iPhone iPad iPod touchscreen maybe become laggy, or slow to respond, or even turn unresponsive, for some users. You can take the following tips to get them solved.
Solution 1. Clean Your Screen. Have a check on your screen to see if there are some oily or liquid splits and clean the screen with soft cloth. If you have a screen protector, you can remove it to have a try.
Solution 2. Restart Your iDevice. Press and hold down the on/off button and drag slide to power off, and then turn on your iPhone/iPad/iPod touch after a few seconds.
Solution 3. Reset Your iDevice. Hold down the power button and home button (volume down and power button on an iPhone 7/iPhone 7 Plus) at the same time. Your phone will reboot in a few seconds and the touchscreen problems should be gone. If it doesn’t work the first time, try it again until it works. In the past, its taken as many as three hard resets.
Solution 4. Restore Your iDevice. Restore your device via iTunes. Make sure to download and install the latest version of iTunes.
We also prepare you a detailed guide: How to Fix Touch Screen Not Working After iOS 11/iOS 10 Update >
iOS 11 Problems - Touch ID Not Working
Sometimes, when we use touch ID to unlock device, or pay a bill at App Store or some other shopping websites, it will be unresponsive, or not working. To solve it, go to Settings on > Tap on Touch ID & Passcode > Enter your Passcode or Password > Turn off iTunes & App Store > Press the Home button and reboot your iPhone or iPad > Then go to Settings and turn on iTunes & App Store in Touch ID & Passcode.
For more useful solutions, please read this guide >
iOS 11 updating sometimes will also lead to some apps breaking down, and iMessage is one of them. Under this iMessage not working problem, iMessage cannot be delivered, iMessage stuck on activating screen, an error occurred during iMessage activation, message app keeps crashing, or iPhone/iPad not receiving or sending messages. But there are plenty of methods to fix them,
iOS 11 Problems - iMessage Not Working
1. Check if Apple's iMessage server is down.
3. Make sure Messages is set up correctly. Check you're set to send and receive iMessages by going to Settings > Messages and checking that iMessage is turned on. Also check that your phone is set up correctly to receive iMessages: go to Settings > Messages again and check the addresses and mobile number you have listed in Send & Receive.
4. Turn iMessage off and on again and restart Messages.
5. Delete some messages. If there are too many videos and photos, they will also cause iMessage slowing down.
To get more info on iMessage/message issues in iOS 11, refer to this quick guide >
iOS 11 Problems - Cannot Connect to App Store
Many users also complaint about that iPhone iPad cannot connect to App Store, App Store not working, or down, after updating to iOS 11. How to fix it?
1. Turn On Cellular/Mobile Data for App Store. Many times we have disallowed App Store to use cellular data. Go to Settings > iTunes Store&App Store > Enable Cellular data
2. Sign Out from iTunes and Sign In again.
3. Set Date & Time automatically. Settings > General > Data&Time > Toggle on Set Automatically.
Read more tips to Fix App Store Not Working on iPhone iPad iPod >
iOS 11 Problems - Unable to Download App
Besides App Store is down, we often face with troubles of app not downloading and updating. To fix them, restart your device and try the download again. It should work. If your download or upgrade is still stuck, rapidly tap Update on an app before the Open symbol appears.
If you want to know more app issues and solutions, you can refer to this guide: How to Fix App Problems on iOS 11/iOS 10 >
iOS 11 Problems - Data Lost after Updating
Every time iOS updating, there are some users reporting that their photos, music, video, contacts, etc. are disappearing. So every time iOS updating we would always notice our users to back up their devices before upgrading, with iTunes, iCloud, or some iTunes alternative application. As if data gets lost, you can directly recover them from the backups. However if unfortunately you have not backed up your devices, there is no need to worry about it, because we can also get back disappeared data with a mobile data recovery software - PhoneRescue.
For detailed information, please refer to how to recover lost data due to upgrading >
For “The developer of this app needs to update it to work with iOS 11”, please refer to: How to Fix Apps Needs to Be Updated to Work with iOS 11 >
Siri is blending in our daily lives. We can just say “Hi, Siri” to find what we would like to eat, where we want to go and how, and more. However there is a possibility that Siri may do not work after iOS 11 upgrading. How to fix this?
iOS 11 Problems - Siri not Available
Solution 1. Make sure network connecting is good, cellular or Wi-Fi.
Solution 2. Go to Settings > Siri and make sure the “Hey Siri” feature is on.
Solution 3. Try resetting your settings by going to Settings > General > Reset > Reset All Settings. Then, set up Siri once again.
Solution 4. If you have Bluetooth on, try turning it off and then trying Siri again.
To get more suggestions on solving Siri problems, please refer to this guide >
Among many iOS users, Safari may be their favorite web browser, including me personally. However Safari would occasionally break down after iOS 11 updating, feedback from many users, with symptoms of Safari not working frequently, crashing all of sudden, page loading slowly, page interface broken, etc. With these Safari issues, you can,
iOS 11 Problems - Safari Breaking Down
Step 1. Check network connection.
Step 2. Restart Safari, or the device.
Step 3. Reset network settings.
Step 4. Clean Safari junk files. Usually we recommend sincerely our users to try with PhoneClean to clean browsing junk files, cookies, temporary files, downloading files, etc. Besides, it also working for Chrome, Firefox, Opera.
If you want to get more detailed information, refer to our tutorial: How to Fix iPhone iPad Safari Not Working in iOS 11/iOS 10 >
TThere's very little chance that you encounter this error on your iPhone when you try to activate but still, when you do, things can be a little bad. However it can still be solved.
iOS 11 Issues - iPhone iPad Activation Failed
1. Restarting your iPhone is going to be one of the simplest ways to try and fix the error.
2. Check to see if the problem is with the SIM-card / carrier. If you are trying to activate a different carrier on a locked iPhone (which hasn't been unlocked yet), you'll get the activation errors obviously.
3. Check Wi-Fi/Network.
4. Restore device with iTunes.
If you want to learn more details, you can check: How to Fix Can't Activate iPhone iPad iPod touch >
iOS 11 Issues - iPhone Reboot Loop
After upgrading to iOS 11, you maybe also encounter iDevices randomly restarting. How to fix this?
1. Check whether the lighting ports of your device are clean.
2. Change another cable, charger and even battery to get your device work in normal.
3. Restart or Force Restart Your Device. Press and hold both of the "Sleep" and "Home" buttons at the same time for 10 seconds until Apple logo appears on screen.
4. Reset All Settings. Go to Settings > General > Reset > Reset All Settings. This method will not remove any data on your device. It just reset all settings to factory default.
Besides the above methods, there are some other simple tips you can have a try, read this tutorial: How to Fix iPhone iPad Keeps Restarting >
iOS 11 Issues - Various iTunes Errors
When we upgrade to iOS 11 with iTunes, there occasionally occur some error messages, such as iTunes error 9/14/39/54/3194...To fix these iTunes unknown errors, you can try these tips:
1. Check USB cable.
2. Update iTunes to the latest version.
We also write many topic pages about these iTunes errors, you can directly visit them to look for more possible solutions:
If iPhone iPad cannot turn on after iOS 11 upgrading, you can fix it with:
iOS 11 Issues - iPhone Won’t Turn On
1. Connect iPhone iPad to power source
2. Try a hard reset
3. Restore iDevice with iTunes
4. Force device to Recovery Mode
5. Put iPhone iPad into DFU Mode
6. Fix iPhone iPad won't turn on with third-party software
Get more detailed tutorial, please visit: How to Fix iPhone iPad Won't Turn On >
iOS 11 Issues - Notifications Appearing Incorrectly
This is a small problem. Normally notifications appear on the lock screen. But after iOS 11 upgrading, they don’t appear as they should, but they’re chopped up and separated between the top, bottom, and middle of the device screen.
Solution 1. Restart your iOS device. Press the Sleep/Wake and Home buttons (Volume Down buttons for iPhone 7/7Plus) for at least ten seconds, until he Apple logo shows up.
Solution 2. Clear all on-screen notifications by tapping (or force pressing) the “x” on the notification screen. Wait to receive a new notification and see if the problem has been fixed.
You can also have a look at this post to find more solutions: How to Fix Notification Not Working on iPhone iPad >
iOS 11 Issues - Stuck on Slide to Upgrade Screen
This problem has been existing on iOS 9/10, it seems still not being solved on iOS 11, either. It frequently occurs when you upgrading iOS 11 directly on device. So the most frequently used method is to restore your device, and upgrade, with iTunes.
Step 1. Update your iTunes to the latest version. Connect your iPhone and run iTunes.
Step 2. Click the device button.
Step 3. Select Restore Backup... and choose a recent backup file. Then click Restore.
If these 3 steps is too much simplified, and to get more details, please refer to this guide >
iOS 11 Issues - iPhone Cannot Make or Receive Calls
In the 16th part, we have already talked about messages not working issues. Just like it, Calls sometimes may have something wrong. You can’t make calls, and receive them. How to fix this?
Tip 1. Reset Network Settings.
Tip 2. Update your carrier.
Tip 3. Verify blocked phone numbers.
Tip 4. Try re-inserting the SIM card.
Tip 5. Try to restore your phone and set it up as new.
IFor more information, please read on this guide >
When restoring and updating devices with iTunes, there could occur one message iPhone/iPad software update server could not be contacted. To fix it, you can try the following tips:
iOS 11 Issues - iPhone/iPad Software Update Server Could Not Be Contacted
Tip 1. Check your network settings and try again later.
Tip 2. Try to update via OTA.
Tip 3. Download the firmware manually for the update.
For detailed description of each tip, please refer to this guide: How to Fix iPhone/iPad Software Update Server Could Not Be Contacted >
iOS 11 Issues - Brick iPhone
The problems in this part probably are the most head-scratching ones, for most of iOS 11 users. During or after updating, iPhone iPad suddenly stuck in recovery mode, on Apple logo, or even become a brick.
To get rid of such problems, you need firstly back up your device, and then try the following tips.
Tip 1. Force Restart your device by holding both Power and Home buttons.
Tip 2. Restore your device with iTunes. You can connect your device to iTunes on your computer and recover in Recovery Mode.
Tip 3. Use an iOS repairing software - PhoneRescue to fix this issue.
For more details, read How to Fix iPhone iPad Stuck in Recovery Mode >
iOS 11 Issues - Unable to Check for Update
iOS 11 has came on September 19th, and you can upgrade your iPhone iPad iPod touch right now, via Air or iTunes. However some users have reported that there is no iOS 11 update notification at all in the Settings , or popping up a message “Unable to Check for Update. An error occurred while checking for a software update.”, when heading to upgrading over the Air. Firstly iOS update not appearing in settings is kind of very common issue for every iOS generation upgrading, not just iOS 11. Secondly, you can try these steps below to fix it quickly;
Step 1. Make sure your iDevice connecting to power charger and Wi-Fi. This is because under low power and cellular data, Apple will not allow iOS updating. Then check if iOS 11 showing up.
Step 2. If you have downloaded iOS 11 beta version on your device, iOS 11 will not appear in the settings, either. So you need delete the beta profile firstly, and then get started the regular version updating. To delete the beta profile, go to Settings > General > Scroll down to Profiles & Device Management > Click on the beat version and delete this profile. Or you can also downgrade from iOS 11 beta to iOS 10.3.3 firstly to delete the beta files.
Step 3. If this iOS 11 bug is till there, you can try force restart your iDevice: Press and hold down the On/Off button > While continuing to hold the On/Off button, press and hold the Home button > Keep holding them until the screen turns back on and shows the Apple logo. Then go to Settings > General > Software Update check if iOS 11 shows up.
Step 4. The last choice is updating iOS 11 with iTunes instead of Air, if all steps above do not work for you. To update iOS 11 with iTunes, here we have also prepared a practical guide to help you: How to Install iOS 11 on Your iPhone/iPad/iPod touch Easily >
Surely, for more detailed methods of this iOS 11 bug, we also write about an article for you, check it now: How to Fix “Unable to Check for Update iOS 11” on iPhone iPad >
As an music lover, Apple Music app would be the most indispensable tool on iPhone iPad; And you would never allow Apple Music not working on iPhone iPad, when you enjoy the songs. So in this part of iOS 11 bugs, we mainly show you how to fix various iOS 11 Apple Music problems.
Normally here are common iOS 11 Apple Music problems we may encounter;
iOS 11 Bugs - Apple Music Problem
If you are suffering from such iOS 11 Apple Music bugs above, or others related, you can try the following quick solutions:
Tip 1. Go to Settings to turn on the Airplane Mode. Wait a few seconds and turn back off again. If this does not work, do this after a reboot.
Tip 2. Restart your device and the Music app, then swipe up on the Music app to close it. Finally, relaunch the Music app.
Tip 3. Go to Settings > General > Reset > Reset Network Settings to reset your network settings.
Tip 4. Go to App Store app, then check out the Updates to update at least one app.
Tip 5. Update the iTunes to latest version.
Tip 6. Force restart your device by pressing and holding the Sleep/Wake (On/Off) and Home buttons together until you see the Apple logo.
Certainly, you can also directly head to the topic page for more detailed solutions to this iOS 11 bug: How to Fix iOS 11 Apple Music Not Working >
After updating to iOS 11, Mail app could also have something wrong occasionally, such as Mail app unable receiving new emails, password incorrect, Mail app blank screen. If such mail problems, please take the steps below:
iOS 11 bugs: Mail Problems
1. Mail App Cannot Receive New Emails and Say Password is Incorrect
Step 1. Open Settings app > Choose Mails.
Step 2. Tap Accounts > Choose the account that has issues > Scroll down and select Sign Out.
Step 3. Go back to Accounts list > Tap Add Account to add your email account.
2. Open Mail App and Find a Blank Screen
Solution 1: Remove the account that has issues and add other email account.
Solution 2: Delete some old emails. Go to your mail account on a computer, and then delete the messages that over 6 MB or any “mail deliver failure” messages. Also delete and then re-add the account on iPhone/iPad.
Solution 3: Restart your device. To do this, you can press and hold down the on/off button and the Home button until the device restart with Apple logo.
Also, if you would like to learn more about iOS 11 Mail problems and solutions, you can directly visit this topic guide: How to Fix iOS 11/10 Mail Problems on iPhone iPad >
3. Unable to Send/Reply from Exchange - Exchange Issues
This is kind of a very big bug on iOS 11. Many user have complained that they cannot send , receive, and replay from their Outlook.com, Office 365, or Exchange 2016 in iOS 11 Mail app on iPhone iPad, after upgrading to iOS 11. Apple official has already announced this problem and that they will team up with Microsoft to solve this iOS 11 exchange issue.
By far, the practical solution is downloading the free Outlook for iOS client from the App Store. The Outlook for iOS client fully supports various email services, including Outlook.com, Office 365, and Exchange Server 2016. Hope it works for you.
Obviously this post has not covered all iOS 11 bugs, an all these titles above are just iOS 11 problems so far, collected from users’ feedback. So if you - our great users have found some others, you can leave them in the comments, and we will update them in this guide with fixes as soon as possible for you. Besides, losing data when upgrading to iOS 11 is also a very common problem, if you get into this trouble, you can directly go to this guide for answers: How to Fix “iPhone iPad Data Lost/Disappeared” After iOS 11 Update >