IOS troubleshooting for Cisco Route switching devices (1)

IOS is the core of a vro switch device, and IOS is internet operate system. It is like a computer's operating system windows. Although it is a software, it cannot run any software if it encounters a problem. Therefore, if there is a problem with IOS, the routing switch device will not be able to run normally, and the configuration commands will all be lost. We can only reinstall IOS.
This document uses cisco 3550 as an example to describe how to restore IOS:
Step 1:Use the control line to connect the console port of the switch to the serial port 1 of the computer, and use the terminal software with the xmodem function to connect to the super terminal software that comes with the Microsoft operating system ).
Step 2:Set the connection mode to serial port 1. If other serial ports are connected, select other serial ports.) The speed is 9600, no verification, no throttling, and the stop position is 1, you can also click "Restore to default. 1)

Step 3:After the computer is connected, press enter to display the switch without ios interface. The general prompt is "switch :"
Step 4: Unplug the power cord after the switch. Press and hold the mode key on the left of the switch panel. Generally, this key is used by the switch. Insert the power plug behind the switch to power the switch. Wait until you see that the Ethernet indicator lights that are not wired on the switch panel are on and several system indicators of the switch are on.
Step 5:Enter:
Switch: flash_init
The following prompt is displayed:
Initializing Flash...
Flashfs [0]: 1 files, 1 directories
Flashfs [0]: 0 orphaned files, 0 orphaned directories
Flashfs [0]: Total bytes: 3612672
Flashfs [0]: Bytes used: 1536
Flashfs [0]: Bytes available: 3611136
Flashfs [0]: flashfs fsck took 3 seconds.
... Done Initializing Flash.
Boot Sector Filesystem
Parameter Block Filesystem