Apple usually pushes update for iPhone users to introduce new features and fix the bugs in the present iOS.
P.S. The newest iPhone operating system iOS 14 has been unveiled. Although the official version has not been released, you could read this guide Should you update to iOS 14 to decide whether you need to try iOS 14 beta to experience its new features in advance.
Updating iPhone is necessary because new iOS often makes iPhone more fluent. However, it is not always easy. The process might fail even if you have downloaded the installation package in iTunes. Just follow this passage to know why it happens and how to solve it.
Why you can’t update iPhone for error 4000 and how to fix it?
Generally speaking, there could 3 possible reasons for the problem:
◆ iOS has been updated on iPhone.
◆ iPhone screen is locked.
◆ The version of your iTunes is too old.
Now use the following methods to fix the issue.
#1 Check the version of iOS on iPhone
The present iOS on iPhone might be newer than the iOS in iTunes.
You need to go to iPhone Settings > General > About to check the software version.
If you have iOS 12.4.4, you cannot use the update of iOS 12.4.3 in iTunes. However, you would find a way to install old version of iOS in the last section of this passage.
#2 Update iOS on iPhone
Meanwhile, you could check whether there is an available iOS update for iPhone.
Go to iPhone Settings > General > Software Update.
It is suggested to backup your iPhone before you install the latest iOS because updating iPhone could not only solving the previous problems but also bring new problems. To avoid issues like losing photos after updating iOS 13, you need to use AOMEI MBackupper to save photos to computer.
#3 Restart iTunes and iPhone
iTunes error code 4000 could also be caused by simple system glitches. If so, just restart both iTunes and iPhone and then try updating iPhone again. You might find newer iPhone update has been prepared in iTunes.
#4 Keep iTunes up-to-date
Old iTunes could not be used to update iPhone and often reports error. You need the latest iTunes on PC.
You need to click Help in iTunes and then select Check for Updates.
#5 Keep iPhone screen unlocked
iTunes can’t import data to iPhone because of privacy issues. You need to unlock iPhone screen when you transfer data between iPhone and computer.
Go to iPhone Settings > select Display & Brightness > select Auto-Lock > check Never.
#6 Enter Recovery Mode
If iPhone still could not be updated for error 4000 after you try every method, there is the ultimate way. It is proved that updating iPhone could be successful after Recovery Mode.
You need to know that putting iPhone into Recovery Mode might make you lose all the data on iPhone, so it is very necessary to backup important data before you execute this method.
There are different operations for different iPhone. Connect your iPhone to iTunes with USB cable and pick the right method for your iPhone to enter Recovery Mode.
◆ iPhone 8 or later: Press the volume+ button and then quickly release. Press the volume- button and then quickly release. Press the power button for seconds and then iPhone would enter recovery mode.
◆ iPhone 7 and iPhone 7 Plus: Press both the power button and volume- button for seconds and the iPhone would enter recovery mode.
◆ iPhone 6s or earlier: Press both the power button and the Home button for seconds and then iPhone would enter recovery mode.
You could see the pop-up below in iTunes and click Update.
How to easily backup iPhone before updating iPhone?
Now you know how to fix error code 4000 in iTunes but your important data should be saved because data disaster could happen at any moment.
AOMEI MBackupper is a brilliant professional iPhone backup software. You can use it to save photos, videos, music, contacts, and messages from iPhone to computer.
Totally Free: Backup and restore unlimited iPhone with AOMEI MBackupper.
Select Data: Preview and select all the items you need from iPhone.
Incremental Backup: Backup iPhone in a professional way to save time and space.
Widely Compatible: Backup any iPhone with AOMEI MBackupper, including iPhone 12/SE 2020.
Download AOMEI MBackupper to computer and follow the steps to easily backup your iPhone:
Step 1. Connect iPhone to computer with USB cable and select Custom Backup.
Step 2. Click the icon of every feature to preview and select iPhone data. Click OK to return.
Step 3. Click Start Backup to quick save everything you select.
Bonus Tips: How to install old iOS?
What if you don’t like the present iOS on iPhone? In fact, you could install any version of iOS by yourself. Before you downgrade iOS, remember to backup iPhone because downgrading iOS would factory reset iPhone.
1. Go to ipsw.com to download the right installation package of iOS to computer.
2. Connect iPhone to iTunes and click the device icon.
3. Press and hold the SHIFT Key and click Restore iPhone.
4. Select the folder you have downloaded to reinstall the iOS.
You could update iPhone experience new features and fix the bugs in the present iOS. If you have problem that you can’t update iPhone for error 4000. You could follow this guide to know why you can’t use iTunes to update your iPhone.
Besides helping you solve this issue, this guide also provides useful tips for you to backup iPhone and install previous iOS. To protect iPhone data, you need to use AOMEI MBackupper to backup iPhone regularly.
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