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Introduction
This document takes you through a step-by-step procedure for upgrading your Cisco 800 Series Router. While an 800 series runs Cisco IOS® software like other Cisco routers, the ROM monitor (TinyROM) and some instructions are slightly different.
Note: If you have a Cisco 806, 826, 827, or 828 series router, see Upgrading Cisco IOS Software [...]

Need to make backup image? Or need to download image? Try the following:
1) Backup image to TFTP server
Router>enable
Router#copy flash:{your IOS image filename} tftp://{TFTP server IP address}
2) Download image from TFTP server
Router>enable
Router#copy tftp://{TFTP server IP address} flash:
Tips
* Under any circumstances, DO NOT delete working IOS image off the router flash memory unless the image has been [...]