How to Ensure You Have a Clean iOS 4.2.x Upgrade?

This morning (Nov. 22 PDT US time) Apple made the latest version (v4.2.1) of iOS available through iTunes. It is one of the highly anticipated upgrade for the iPad and other iOS devices. Not only because this version brings features to the iPad that had been enjoyed by other iOS devices, it is also the first version of the OS to align all iOS devices to the same iOS version.

As a result many iOS device users rushed to download and upgrade their devices, causing slow downs to the iTunes upgrade servers. If you have trouble downloading the new update you can try the following direct download links [compliments of MacStories]

Before you upgrading your iOS device you should always back it up by performing a synchronization using iTunes. I cannot reiterate enough how important it is to do this on a daily bases. Since these devices are mobile and you carry it around, so there is a high possibility of the device being stolen or damage resulting in losing your stored data on them.

The other thing you may need to do if you fall into one of the following groups of users:
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