The below procedure is way to upgrade and replace flash cards in Cisco Systems Devices. Sometimes we need more and bigger size of flash card.
In this example we will show you how to upgrad the flash in both slot:0 and slot:1. To avoid having to change the pointers in the configurations. We will perform the copying of code in slot1: and then move the newly configured card to slot:0. It makes a lot easier.

Cisco Express Forwarding (CEF) is advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions.

• Improved performance

• Scalability

• Resilience

Although you can use CEF in any part of a network, it is designed for high-performance, highly resilient Layer 3 IP backbone switching.

If you got error message below from your system/Cisco 7000 series router.

"Board is disabled analyzed idbs-rem"

Try the following command to bring it back up:

hw-modu slot 3 reload

If it doesn't work, contact Cisco TAC ASAP.