It is more common than it should spit iTunes errors during the upgrade or restore the iOS operating system on their devices.
One of the most common is the 1669, very common in the iPhone 5 when trying to upgrade to iOS 7.
POSSIBLE CAUSES OF ERROR 1669
This error may be due to several factors. Then we give a list of possible causes that may cause the error 1669:
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Water is spilled on the device. This error, but can also be detected by a small red light that appears on the screen, causing the damn error. In any case, if this happen, turn off the device and take it immediately to the nearest official Apple Store.
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Updating or restoring your iPhone, iPad or iPod Touch to iOS 7.
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Problems with iTunes.
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Problem on Apple's servers, which may cause a bad download the new software and therefore the error.
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Using a USB Hub (USB thief, colloquially speaking) instead of using direct USB computer.
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Okay, we have seen the possible cause of the error 1669. Let's fix it.
SOLUTION 1
Step 1: Make a backup of your iOS device to prevent accidents if something goes wrong.
Step 2: Delete the cache iTunes. To do this, enter the program and access to Edit / Preferences / Advanced and click Reset warnings and Reset cache.
Step 3: Uninstall iTunes on your computer and make sure you delete the folder containing the program after uninstallation. The default is located in C: \ Program Files \ iTunes, although this will depend on your operating system and whether you've installed in a different location.
Step 4: Download and install the latest version of iTunes from the official website.
Step 5: Connect your iPhone, iPad or iPod Touch to your computer, open iTunes, click Restore and install the latest version of iOS available.
SOLUTION 2
This method is more laborious but has higher satisfaction rate in resolving the error. If you've tried the solution 1 with disastrous results, we go for the second:
Step 1: Make a backup of your iOS device to prevent accidents if something goes wrong.
Step 2: Connect your iPhone, iPad or iPod Touch to your computer and open iTunes.
Step 3: Put your device in DFU mode. To do this, press and hold both the Home button (Home button) and the Power button (Sleep / Wake button). After 10 seconds, release the Power button but continue holding the Home button another 10 seconds.
DFU Mode on iPhone
If done correctly, the device screen will turn black and iTunes will detect that the device is in recovery mode, a popup message alerting.
Step 4: Give Restore.
Step 4a: If you want to manually download the iOS software or already have it on your computer, press Shift + Restore (Windows) or Alt + Restore (Mac) to select the file and restore the device.
Emplees the method you employ, with the restored device you only need to restore the backup you made previously to leave everything as before, but more updated;)