Many iOS device users have received the error message about error 56 when attempting to update their devices with iOS 9.3.2. They usually get an alert message saying: "iPhone (iOS device) cannot be updated. An unknown error occurred 56" or "Software Update Failed: An error occurred while downloading iOS 9.3.2" when updating an iPhone, iPad or iPod touch to iOS 9.3.2.
Your iOS device will fail to be updated and even stops working normally if you receive such kind of error message (error 56) during installation of iOS 9.3.2. Usually, the update goes smoothly at the beginning but fails with error 56 finally during the iOS 9.3.2 updating process, in which situation it will instruct you to connect your iOS device to a computer which has an iTunes installed.
Method 1, check the USB port
When you fail to update your iOS device by receiving the message error 56, you can connect your iPhone, iPad or iPod touch to another USB port of your Windows or Mac computer to see if the USB port works well. Then, try to restore your iPhone with iTunes backup. If the problem still exists, you can continue to perform following operations:
1. Remove all other USB devise except keyboard, mouse and your iPhone (iPad or iPod touch).
2. Reboot your computer and then try to restore iPhone (iPad or iPod touch) from iTunes backup.
Method 2, close all unnecessary third-party software
Sometimes, you may face error 56 problem on iPhone, iPad or iPod touch during iOS 9.3.2 update due to software conflict. Therefore, you can close all unnecessary programs such as antivirus software, game applications, etc and then try to update the iOS 9.3.2 on your device.
Method 3, restore your iPhone on another computer
You can connect your iPhone to another computer and install the latest iTunes version on this computer. Then, you can try to restore your iPhone on this computer to fix the error 56 occurred on your iPhone after updating to iOS 9.3.2.
Method 4, update your iPhone, iPad, iPod touch in DFU mode
If you keeps getting the error 56 and fail to update your iPhone, iPad or iPod touch to iOS 9.3.2, you can put your iOS device to DFU mode to update it. You can follow the steps below to put your iOS device in DFU mode (take iPhone as an example):
1. Connect your iPhone to computer and then turn off the iPhone.
2. Press the Home and Power button together on your iPhone.
3. Only press the Home button when you see the white apple logo.
4. Run iTunes and you can press Shift key when your iPhone enter the DFU mode. Now, you can click Restore and select the firmware to restore.
Method 5, send your iOS device to Apple device repair shop
If you still cannot resolve the problem after trying all methods above, you had better send your iOS device to apple device repair shop to ask professional people to fix the problem.
When receiving error message showing that iOS device cannot be updated and an unknown error occurred 56, you may lose important data stored on your iOS device. Usually, iOS update does not cause data loss, but data usually gets lost if iPhone is crashed due to iOS update failure. In this situation, you can restore iPhone / iPad / iPod touch from iCloud backup or iTunes backup. Or you can restore data from iOS device by using data recovery for iPhone.