Recovery IOS image with help of serial (console) and xmodem

This guide is only for recovery of a broken IOS image on you Cisco switch!.

First download a new image from Cisco. Is require a Cisco login, ask you dealer for a login for Cisco or a IOS image for you switch.

  1. Download Tera Term Pro: http://hp.vector.co.jp/authors/VA002416/teraterm.html
  2. Connect to the serial port in Tera Term Pro – Setup -> Serial port.
    Port: Com2 (Or what you serial port number is)
    Baud rate: 9600
    Data: 8 bit
    Parity: none
    Stop: 1 bit
    Flow control: none

    Then press OK

  3. Now you are connect to the switch and the switch shows “switch: “, here type:
    flash_init
    set BAUD 115200
  4. Now the serial speed is set to 115200, so the transfer will go a lot faster, so we just need to disconnect tera term and connect again with the new baud rate.
    In Tera term go to File – Disconnect
  5. Now we need to setup a new connection – Setup -> Serial port.
    Port: Com2 (Or what you serial port number is)
    Baud rate: 115200
    Data: 8 bit
    Parity: none
    Stop: 1 bit
    Flow control: none

    Then press OK.

  6. Now we are connect with baud rate 115200, then type:
    copy xmodem: flash:image_filename.bin
    Where image_filename.bin, is the filename of the image, if you image lastname is .tar you need to unpack it first. Use 7zip for that. http://www.7-zip.org/download.html
  7. Then wee need to send the image to switch choise File -> transfer -> send in tera term.
    And pick up you new image file, and wait for tera term to finish.
  8. After the upload has finish type:
    boot flash:image_filename.bin
  9. Then the image will boot. Now you need to setup the switch so it will boot automatic on that image everytime you reboot the switch, go to configure terminal (conf t)
  10. Here you type:
    boot system flash:image_filename.bin
    And maybe you want to set the baud rate to default 9600 agian
    line con 0
    speed 9600
  11. exit the configure terminal and type:
    wr mem

Now you are finish recovery you switch.

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