Once fail upgrade your iPhone,iPad to iOS 9.3, iOS 9.2,it may cause your devices stuck in recovery mode, Apple Logo, iTunes screen,ect.Don't worry,this iPhone System Repair tool can help you fix iOS 9.3 Bug and turn iPhone system to normal.

1.Getting Stuck at "Slide to Upgrade" screen
A number of users have reported that their device is getting stuck at the "Slide to Upgrade" screen. The only way to resolve this issue is by putting your device in recovery mode, and restoring it from backup. But before you do that don't forget to take a backup of your device using iTunes.
Check our post for more details to fix iOS 9 update getting stuck at "Slide to Upgrade" screen.

Learn the use guide: Fix iPhone Stuck in Endless Reboot Loop after iOS 9 Update or Jailbreak

2. Touchscreen not working or Unresponsive
I've observed that at times an app stops responding. It just stops responding to touch input. In this case, double press the Home button, and swipe up on the card for the app to kill it, and relaunch the app again. I have also heard that in some cases iPhone or iPad's screen stops responding on the Home screen, you don't need to panic. In most cases force restarting your iPhone or iPad will resolve the issue. To force restart your device, press and hold the Power (Sleep/Wake) button and the Home button simultaneously till you see the Apple logo.

Read more: Fix iPhone Touch Screen Not Work

3. App Crashing issue
If one of your favorite app or apps are crashing after upgrading to iOS 9, then it could be due to compatibility issues with the latest iOS software update. Check the App Store to see if the developer has released an update to support iOS 9. You can also try to delete the app and reinstall it again to see if it helps. Before you delete the app, make sure the data has been linked to iCloud or any other cloud services, so you can restore it after reinstalling.

4. iOS 9.3 is slow
A number of people are reporting that their devices are more sluggish after upgrading to iOS 9. Some users feel that iOS 9 is slower than iOS 8. If you've just upgraded to iOS 9, then you should ideally give it a few hours or a day for indexing and to complete other background activities.

5. iOS 9 Battery life problems
Based on the poll we took few days back, it looks like a high percentage of users seem to be having battery life problems after upgrading to iOS 9.
The problem with battery life issues is that it is very subjective as it is based on your usage pattern, so it is difficult to pinpoint what exactly is causing a problem.

6. iOS 9 Wi-Fi Problems
Another common problem people are facing after updating their iPhone or iPad to iOS 9 is Wi-Fi connectivity problems.
The issues being reported include not being able to connect to a Wi-Fi network, getting incorrect password prompt despite entering the correct password, Wi-Fi settings grayed out, dropping connection intermittently or speeds being extremely slow. Most networking related issues I've experienced have been fixed after resetting network settings. Resetting these settings flushes caches and clears DHCP settings and other networking related info. To reset network settings, open the Settings app and navigate to Settings > General > Reset and tap on Reset Network Settings.

7. iDevices are Overheat
Some users reported that their devices are getting hot after iOS 9 update, this might relate to the battery overworking. Try to close all apps you don't need, turn off your wifi or mobile data, and get a new cooling case -available for iPhone 5/5s or iPhone 6.

8. Speaker malfunction
A weird bug reported by some users that when the phone is paired with a Bluetooth device, the speaker drop any sound. If you face it, then you should turn off your Bluetooth.

9. iOS Devices Keeps Freezing during/after Upgrade
To help to get rid of this issue, you can try the following tricks.
Try a Hard Reboot
To do a hard reboot, simply hold down the Home button and Power button simultaneously until you see the Apple logo. Keep holding those two buttons down for at least 30 seconds. If nothing happens, move on to the next step.
Plug into a wall outlet
Sometimes plugging into a wall outlet like you were going to charge your iPhone or iPad can trigger it to boot up. Try plugging your device in and leaving it that way. If, after about 15 minutes, your iPhone or iPad is still not responding, move on to the next step.
Reset all settings
If your iPhone, iPad, iPod freeze after iOS 9 upgrade, and the previous solutions didn't help, you should reset all settings.
Navigate to Settings>> Tap on General >> Tap on Reset >> Choose Reset all Settings.
Read the full solutions here.

10. Stuck on Apple Logo/iTunes screen during iOS 9.3/iOS 9.2/9.1/9 Update
This is a common and annoying problem that when we try to update to the new OS, the iDevices is more likely to be stuck on Apple logo and can't boot up completely. If your iPhone or iPad stays on Apple logo screen during iOS 9 update, you can try the force reboot your iPhone or put it in recovery mode.
Hold and Press Home & Power button for 10 seconds to reboot your iPhone. If it still stuck on Apple logo, you will need to put it in recovery mode.
Plug the iPhone to your computer via the USB cable and make sure that the latest iTunes is installed.
Press and hold Home & Power button for 10 seconds. Then release the power button but keep pressing the home button.
You will see the Connect to iTunes screen and you can let go of the Home button.
Now you can restore your iPhone with iTunes.
Learn How to Fix iPhone Stuck on iTunes Screen

11. Stuck in Recovery Mode/iTunes Logo after upgrade
Users complain that the iPhone is stuck in recovery mode as they found the iTunes logo on the screen. Now, follow the steps to get out of iTunes logo if you stuck in Recovery Mode after upgrading to the newest iOS 9. Before start, make sure you have installed the latest version of iTunes: Hold both the home screen and the sleep/wake button for 10 seconds and the device will turn off. Now, turn it on again and you may find that your phone will start normally.
See How to Fix iPhone Stuckc in Recovery Mode after iOS 9.3 Update

12. iOS 9.2/9.1/9 Update Failed
There are 2 simple tricks if you're running into this problem updating to iOS 9.
The first is try, try and then try again.Apple's servers are currently under a lot of pressure, rolling out today's operating system change to millions of iPhones and iPads worldwide. That's a lot of required bandwidth.
The second solution is to go old-school by manually downloading the software to your phone or tablet. This requires a USB lightning cable, a computer and iTunes. Yes, you have to boot up Apple's old music software, the one that isn't Apple Music.

13. Compatibility Issues with Apps
After update ios 8 to iOS 9, many users are crying that they are shocked and disappointed that part of the apps which work well on iOS 8 are simply not compatible in iOS 9. So the only quick fix to this problem is to downgrade to iOS 8 from iOS 9.

14. Downloading iOS 9.2/9.1/9 to iPhone iPad, Much More Space Needed!
Though Apple officially said that the iOS 9 downloading just occupies your 1.3 GB space in size, it's definitely a thunderclap for certain iPhone iPad users whose iPhone iPad space range from 8GB-16GB, especially for those who doesn't sync to iTunes to store their daily files.
Don't worry, iOS 9 allows you to temporarily delete apps in a bid to successfully download iOS 9. And after iOS 8 to iOS 9 upgrade is over, all deleted apps will be automatically replaced. And if you don't wanna try this method, you can also free up iPhone iPad space, which is also a good way to guarantee you smooth fix iOS 9 space problem.

15. iOS 9 update iPad problems
There are complaints on forum that report they have suffer from iOS 9 update problems on iPad like the movie box not working on ipad, they can't get split view on iPad, no low power mode on iPad after updating to iOS 9 etc. Some of those iOS 9 problems also happens on iPhone.

16.Data lost after iOS 9 upgrade

Every iOS upgrade,it may cause erase data on your iPhone, iPad,however,you can use a iOS 9 Data Recovery to recover lost iPhone data after iOS 9 upgrade,the Dr.Fone iOS Data Recovery allows you recover lost contacts,photos,videos,sms,notes,call logs,whatsapp,ect from iPhone 6S/6/5S/5/5C/4S/4 and iPhone SE.

Read more: how to recover data from iPhone after iOS 9 Update

iOS System Recovery provides three simple ways for any iPhone iPad iPod users to directly restore the lost and deleted data including contacts, messaging, photos, videos, call history, notes, calendars, reminder, Messenger, Safari bookmark, etc., or extract the lost data from iTunes or iCloud backup with ease. So, you can restore lost iPhone iPad data after upgrading to iOS 10/9.3.3/9.3.2/9.2.1 with the help of this software. Besides, you are allowed to get iPhone iPad out of recovery mode/white Apple logo screen/black screen and so on with a click, as well as iPhone and iPod touch.

You must try this:

How to Repair iOS System to Normal for iPhone 6/6s

How to Repair iPhone That Won't Turn On Without Losing Data


https://www.youtube.com/watch?v=rvyH5U1HaeY

The crashed system, incompatible iOS software, faulty apps and whatsoever may cause your iPhone becoming freezing.
However, you can repair it by checking the cause first.
Sometimes, to fix it with professional tool, like iPhone system recovery for Windows, you can easily get the device to normal and repair the system issue without data loss. It's safe-guaranteed.
Related: 6 Solutions to Fix iPhone Keeps Freezing