Upgrading your router's IOS is a critical operation. You need to be careful and cautious with every command you write. Take a look on these hints and tips before you start upgrading.
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When would you need this: When you want to copy IOS file from one router to another for the purposes of upgrade or install. This is usually required when you do not have a TFTP server around.
Special Requirements: The flash size of the destination router should be adequate for the new IOS file size.
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When would you need this: When you are planning to upgrade the IOS file or you need to copy it to another router.
Special Requirements: None.