Receiving error messages while updating or restoring your iPhone, iPad, or iPod Touch is a problem. One of these errors, which we see quite often, is iPhone Error 2009 or iTunes Error 2009. A user who uses an iPhone, iPad, or iPod Touch and updates or restores their device in iTunes may receive a message saying "The iPhone (device name) could not be restored. An unknown error has occurred (iTunes 2009 error), "Error 2009" is just one of many possible errors, but this error will prevent you from updating or restoring your phone.
In order to avoid getting this iTunes Error 2009 in the near future, or if you already have one, it is best to practice effective methods to avoid and eliminate this iTunes 2009 error.
1.Always use the original USB cable that came with your device. This is a tip common to all iOS owners, especially when connecting the device to a computer or USB ports. If you do not have it anymore, try using another USB cable, as long as it comes from Apple.
2.If the number 1 fails, try changing the USB port on your computer. Do not connect the USB cable to the keyboard.
3.If the above step does not work, switch to a USB port using another computer.
If you're still experiencing the iTunes Error 2009 message, check for other issues related to the USB drive, you may also want to check the third-party anti-virus software and then other hardware.
Solution 1: Restart your computer.
Many of the errors that unexpectedly appear may disappear after you restart your computer. Once you turn it back on, start iTunes, then start the update or restore it.
Solution 2: Update iTunes.
See if there is an update available. If so, download it and install it.
Solution 3: Reinstall iTunes.
In many cases, the problem can come from iTunes and, unfortunately, the update does not always solve it. Uninstall the software from your computer, download the latest version and install it.
Solution 4: Make sure your antivirus program is up to date.
This can be very important too. Check for updates for your security software. Download and install, and when finished, try to restore or update your iPhone.
Solution 5: Disable the iTunes assistant.
If you are a Mac user: Go to System Preferences, Accounts, and then click Login Items. You will see the iTunes Helper here. Disable it. If you are a Windows user: Click Start, choose Run, type MsConsfig, and press Enter. Find the iTunes Assistant and disable it. After a while, iTunes will reactivate the process, but it does not matter. You will only need it until the end of the restoration or update.
Hope these 5 ways to fix the 2009 iPhone error will be helpful. If this is not the case, call Apple for instructions or visit one of their stores.