How to fix iTunes error 4005 on iPhone 6?

Restore iPhone 6 through iTunes is much more trouble than you think. When you update or restore iPhone 6, error 4005 usually appears. Why does iTunes error 4005 occur? During the operation, the 4005 error on the Apple mobile phone is generally a computer problem. You can try to replace a computer. If there is no other computer, please try the following steps. In this article, we will show how to fix iPhone Update / iTunes Restore Error4005. The details are as follows.

1. Force restart iPhone 6

Some software errors can cause iPhone 6 got an unknown error 4005; we can try to fix it by restarting.

In order to force restart iPhone 6, please press and hold the iPhone Home button and iPhone power button at the same time, continue holding both buttons for about 10 seconds, until the Apple logo appears.

After restarting, try to restore it again, but it still failed, the iTunes error 4005 still exists.

2. Make sure the iTunes is latest version

As we know, the older versions of iTunes are prone to conflict between hardware and software processing, so that a stable connection may not be formed, and then cause iTunes unknown error 4005.

Before we use iTunes to restore the iPhone 6, we need to update the iTunes to the latest version. Open iTunes on the computer, and then find the Update iTunes button on your iTunes program and upgrade to the latest version.

After updating, restore again, but the 4005 error is still there.

3. Disassemble the iPhone 6

In order to check iPhone 6 hardware aspect, firstly we should disassemble the iPhone.

Use screwdrivers to remove the screws next to the iPhone lightning port, put iPhone on the CPB screen separator, after a while, open the iPhone display screen, and then carefully take out the iPhone motherboard.

How to fix iTunes error 4005 on iPhone 6?

4. Measure the iPhone Nand flash

According to our repair experience, for the iTunes error 4005, there are 2 situations in hardware aspect, one is the iPhone CPU problem, and the other one is the iPhone Nand flash problem.

First we should use digital multimeter to measure the iPhone Nand flash power supply 3V, iPhone power supply C0604 1.8V, CO603 1.2V and C0625, all voltage tested are normal.

Now, we need to measure the resistance value for iPhone Nand flash, but it's still normal.

5. Re-soldler the iPhone Nand flash

Use QUICK 861DW hot air rework station to remove the iPhone Nand flash, and the put iPhone motherboard under the Stereo Trinocular Microscope, re-welding the pins on the iPhone Nand flash, and then solder the iPhone Nand flash back to iPhone motherboard.

6. Test the iPhone 6

Next assemble the iPhone 6, connect iPhone to the computer, and then use iTunes to restore it, now it works, there is no unknown error code.
After entering the iOS system, all functions tested are normal.

When there is a problem with your iPhone phones, proceed with system recovery carefully. We hope these methods can solve the iPhone error 4005 problem. If you have any comments, questions and suggestions, welcome to contact us on

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