Configuration Guide
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... the Router 3 If after five attempts a valid Cisco IOS image is not found in Flash memory, the router reverts to boot ROM mode (which is used to install or upgrade a Cisco IOS image). 4 If a valid Cisco IOS image is found in NVRAM, the router runs the System Configuration Dialog so you begin to configure the router. 4-2 Cisco 2524 and Cisco 2525 Router User...
... the Router 3 If after five attempts a valid Cisco IOS image is not found in Flash memory, the router reverts to boot ROM mode (which is used to install or upgrade a Cisco IOS image). 4 If a valid Cisco IOS image is found in NVRAM, the router runs the System Configuration Dialog so you begin to configure the router. 4-2 Cisco 2524 and Cisco 2525 Router User...