The iPad allows users to gain access to the Internet, listen to music, watch digital videos, and play games. If you have the Error 21 message on your iPad tablet, you have a third-party security software issue. Choose one of several ways to get rid of this issue. Common causes include an incorrect date or time on your computer, not being logged in as an administrator and not having the most up-to-date version of iTunes on your system.
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Click on the time clock on the upper right hand side of your computer screen if you are using Mac OSX. Click on the time clock on the lower right hand side of your computer screen if you are using Windows 7.
Use the number pad on your computer to input the correct time and date into the clock and calendar displayed on the screen.
Click the "OK" button at the bottom of the screen to apply the changes. Plug the iPad into the USB port on your system through the USB cable that came on purchase. Wait for iTunes to automatically open.
Click the "Update" icon when it appears on the iTunes screen when it appears. Wait for the update to complete. This could take up to an hour depending on your Internet connection.
Fixing Time and Date
Click the "Apple" icon at the top of the computer screen if you are using OSX. Click the "Start" button if you are using Windows.
Click the "Log Out" option in the menu for both operating systems. Wait until the "Welcome" screen appears.
Type the username and password for the administrator account into the fields provided for both operating systems. Press the "OK" button to sign in as an administrator.
Update the iPad through the iTunes software to relieve the error.
Double click on the iTunes icon on your Windows 7 or OSX desktop or dock. Wait for the program to load.
Click the "Update" icon when it appears on the software screen. If you do not have the most up to date version of the software, it will prompt you to update the software when the program loads.
Wait for the software to update. This should take about 5 minutes, but could be longer if you haven't updated the software in a long time. The software will restart after the update has occurred.
Plug the iPad into the computer through the USB cable that came with the device. Click the on the "Update" icon in the iTunes window to update your iPad and remove the error.
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