如果您的路由器的flash因为意外丢失了IOS，您可以在ROM monitor commands模式下通过如下两种办法恢复:
　　1) xmodem—Use this if the computer attached to your console has a terminal emulator that has xmodem capability.

　　2) tftpdnld—Use this if you have a TFTP server directly connected to the Ethernet 0 port.

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