You will notice that whenever a restore is to be
made, Apple contact its server to verify if that IPSW is currently
being signed or not. Also it checks the integrity of the
IPSW to be restored. Therefore, whenever iTunes encounter troubles in carrying out these tasks, error 40 may occur.
To solve this problem, carefully follow these steps
Environment Requirements
- Download iTunes 11
- iPhone USB cable in excellent condition
Step 1: Close all running applications on your computer
Step 2: Reboot your computer
Step 3: Stop antivirus running that may have activate firewall on your computer
Step 4: Open a folder and click on
Organize at the top-left of the window
Step 5: Click
Folder and Search options, click
View and make sure
Show hidden files folders and drives is checked.
[You must be registered and logged in to see this image.] Step 6: Click on the windows key on the keyboard and type
Notepad Step 7: Right Click on Notepad and select Run in Administrator.
[You must be registered and logged in to see this image.] Step 8: Click Open at the top – left window of the Notepad window. Navigate to this directory
C:\Windows\System32\drivers\etc[You must be registered and logged in to see this image.] Step 9: It may be empty, Just change the options from the box at the right side of the window from Text documents to All files
Step 10: elect
hosts and it will display in the Notepad as shown in the image.
[You must be registered and logged in to see this image.] Step 11: Remove any link aside from what is in the image
Step 12: Click File, Save and exit Notepad
[You must be registered and logged in to see this image.] Step 13: Launch iTunes and then connect device with a good USB cable attached to the computer directly
Step 14: Hold Shift on the keyboard while you click Restore
[You must be registered and logged in to see this image.] Step 15: Now restore you device again using a stock IPSW and you won’t see the error anymore
Step 16: If problem persist, use another computer to perform the restore
iTunes
error 40 is fixable. All you need do is follow the instructions
carefully. Please feel free to comments on your success or where you
have issues.