To use the ROM monitor, you must have access to the console port. The new configuration register value, 0x0, is effective after the router is rebooted with the reload command. The router remains in the ROM monitor and does not boot the operating system. If the configuration value remains 0x0, you must manually boot the operating system from the console. During this 60-second period, you can break to the ROM monitor prompt by pressing the Break key.
Commands are case sensitive.
You can abort any command by pressing the Break key at the console. A term in italics means that you must fill in the appropriate information. This section lists some useful ROM monitor commands. Refer to the Cisco IOS configuration guides and command references for more information. The boot command with no arguments boots the first image in Flash memory.