The use of iTunes , no one knows. From copying data, recovering your device password, to backing up and recovering data ... However, there are many errors with this software that cause users a headache, one of which is is "error 20" - An error is said to be the most common and most common when users restore iPhone with iTunes .
Restore iPhone is the way we usually perform when our device has an error or in some cases required to do. Currently you can use both iTunes and iTools to restore iPhone, however, it is reported that when performing this method with iTunes, error 20 will occur relatively much.
"Error 20" is defined as a system message when the user is making a device connection to iTunes and attempting to perform the Restore iPhone operation .
This error is determined to occur primarily when users downgrade iOS version and the reason is determined by several reasons as follows:
Hardware error:
Software error:
Need to determine where the error lies? How? In order to choose the most appropriate, economical and effective way to avoid damage, other unfortunate errors may occur.
Handling hardware errors:
Handling software errors:
In other cases, the following instructions may be followed:
Step 1: An error occurs while downgrading the iOS operating system, you can try to put your device into DFU mode. How to implement this mode has been mentioned by Download.com.vn, you can refer to:
Step 2: If the iPhone screen is still black, but on the computer, iTunes reports that it has received the device or heard a successful connection in recovery mode, we have put the device into DFU state. success.
Step 3: Press, hold SHIFT and left-click on Restore in iTunes to start the Restore process.
Step 4: Wait for the process to be completed and the device will work normally again.
ATTENTION:
You should consider carefully before deciding to upgrade your operating system, because not all devices can be upgraded, supported by new versions. Therefore, if you try, not only the error process, but even when you want to downgrade back, you are also prone to this "error 20" or many other errors.
I wish you successful implementation!
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