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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter       Upgrading the Cisco IOS Software
Additional References
Additional References
The following sections provide references related to upgrading the system image on your router.
Related Documents and Websites
Technical Assistance
Related Topic Document Title or Website
Matching Cisco IOS releases and features to hardware Cisco Feature Navigator 
http://www.cisco.com/go/fn
Downloading system images
Displaying minimum DRAM and flash memory 
requirements
Cisco IOS Upgrade Planner
http://www.cisco.com/cgi-bin/Software/Iosplanner/Planner-tool/
iosplanner.cgi
Choosing and downloading system images Software Download Center
http://www.cisco.com/kobayashi/sw-center/index.shtml
Loading and maintaining system images http://www.cisco.com/en/US/docs/ios/fundamentals/configuration/
guide/cf_system_images.html
Removing, inserting, and upgrading compact flash 
memory cards
Hardware installation guide for your router
Connecting your PC to the router console port Hardware installation guide for your router
Description Link
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containing 30,000 pages of searchable technical 
content, including links to products, technologies, 
solutions, technical tips, and tools. Registered 
Cisco.com users can log in from this page to access 
even more content.
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1. You must have an account at Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box 
and follow the instructions that appear.
http://www.cisco.com/public/support/tac/home.shtml