Answer for “iPhone Update Error 4000”

Solutions

Following are some other solutions you can try to fix iPhone update error 4000:
a. Restart Your iDevice and Your Computer

This is a simple yet effective solution that may or may not solve the problem. However, some users had success updating their iPhone after restarting their device and computer so it is definitely worth a try. Simply unplug your iPhone from your computer and restart it and also restart your computer. Then plug the iPhone back in and try to update it via iTunes. It is likely that it will be updated without any issues.
b. Plug Your iPhone Directly into Your Computer

If you are failing to update your iPhone via iTunes while plugging it into USB port attached to your keyboard or USB hub, then it is recommended that you unplug your iPhone from your computer and plug the cable directly into one of your computer’s USB ports and then try to update it via iTunes. This may seem like an odd solution but it may work and is certainly worth a try.
c. Disable Your Antivirus Software

Antivirus programs sometimes conflict with iTunes’ operations. It is likely that your antivirus software is preventing certain processes of iTunes from properly working, hence causing error 4000. So, it would be a good idea to temporarily disable your antivirus and then try to update your iPhone via iTunes. Once your iPhone is updated successfully, enable your antivirus software.
d. Make Sure You Are Using the Latest Version of iTunes

It is possible that error 4000 iTunes may be occurring because you have older version of iTunes. To avoid issues such as error 4000, it is recommended that you make sure that you are always using the latest version of iTunes.

Follow these instructions to update iTunes:

Step 1: Launch iTunes on your computer.

Step 2: Navigate to Help > Check for Updates.

Step 3: If an update is available, then follow the on-screen instructions to update iTunes to the latest version.
How to Update iPhone iOS via iTunes

Updating your iPhone iOS via iTunes is a straightforward process. You simply need to make sure that your iPhone is detected on your computer as well as in iTunes properly and your computer is not using Personal Hotspot on your iPhone when updating.

Follow these instructions to update iPhone iOS via iTunes:

Step 1: Connect your iPhone to your computer via compatible USB cable.

Step 2: Launch iTunes and select your device.

Step 3: Navigate to Summary > Check for Update.

Step 4: If an update is found, click on Download and Update option. Then follow the on-screen instructions to complete the updating process.
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