Fix iTunes Error 20, 21, 23, 26, 28, 29, 34, 37, 1, -1

Fix iTunes Error 20, 21, 23, 26, 28, 29, 34, 37, 1, -1  – while restoring, upgrading or downgrading iPhone 4S, 4, 3GS or iPad3,2,1 or iPod touch on iOS 4.x or iOS 5.x or iOS 6.x on Windows and Mac.
Fix iTunes Error 20, 21, 23, 26, 28, 29, 34, 37, 1, -1
How To Fix iTunes Error 20, 21, 23, 26, 28, 29, 34, 37, 1, -1

Fix iTunes Error 20, 21, 23, 26, 28, 29, 34, 37, 1, -1
There are certain conditions when your iTunes doesn’t work properly. So, indirectly you may have some errors which make it really difficult to use iTunes or even sync your iPhone, iPod Touch or iPad. These issues and errors are may be due to the security software installed on your PC or Mac. Security software basically hinders the connection of iTunes with your iDevices or even the internet. Due to which certain issues my come which even may become very hectic sometimes. Some of the examples of these errors will do the following things with your iTunes and iDevice.
  • You will not be able to even open the iTunes.
  • iPhone, iPod Touch or iPad will not be shown in the iTunes under devices tab.
  • Unable to connect internet, so indirectly you will be unable to make purchases or even download any type of content from App Store.
  • You Can’t Sync your iPhone, iPod Touch or iPad with iTunes.
  • You will not be able to make Backup or restore your iPhone, iPod Touch or iPad.
  • You will not be able specific functions of the iTunes such as the “Home Sharing”.
  • Lastly, when connects an iPhone, iPod or iPad, it greatly effects the performance of the computer making it so poor to even hard to use.
How to solve these types of Problems:
Verify all information on your PC:
1st of all, please make sure that you have verified all of the information on your PC and such as:
  • Date and time on your PC are accurately set.
  • You are using your PC as Administrative
  • iTunes on your PC is updated to latest version.
  • Internet is properly working.
  • Verify your router or modem firmware is up-to-date.
  • The last thing in information is that, your Mac OS X is updated to latest version.
Verify the Security Software or Antivirus version on PC/Mac
The next thing is please verify that your Security software is updated to latest version. Mostly, it is under the Help tab on the Security software. There are no risks associated with updating the Security software, so feel free to update it.
Configuring the security software for iTunes and Apple:
After verifying the information and updating the security software, the next thing is to configure it properly. You will have to configure that in such a way that it should allow iTunes to contact Apple. We can’t provide you with any specific information of configuring because every security software uses a different method. You may find your one’s probably under the tools tab.
Disable or Uninstall security software:
We you have tried every method and still if iTunes is not working properly, we will recommend you to temporarily disable or uninstall the security software on your PC or Mac so that iTunes can directly contact with iTunes.
If your problem persist, don’t hesitate to comment in the section below.

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