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gsmitheidw/Reflashing-Cisco-Switch-Serial.md

Last active December 10, 2019 16:20
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Unbricking a Cisco Switch
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Reflashing-Cisco-Switch-Serial.md

Reflashing Cisco Switch

(2960 or equivalent without USB etc) over serial

Kinda used to having modern equipment with USB etc, unbricking this was harder than expected and tftpd64 and equivalents weren't proving reliable for me. Hope this helps others.

Assumptions/Requirements:

  • Console cable connected from serial/rs232/com port on windows to switch on console port.
  • Have a copy of the firmware required from the cisco website
  • Have the firmware extracted from tar/zip/whatever, I suggest 7zip.
  • Download a copy of Extraputty.

Procedure:

Using extraputty - console in over serial port. Make sure baud is 115200 or this will take hours.

At "switch:" prompt

flash_init
load_helper
copy xmodem: flash:c2960-lanbasek9-mz.122-55.SE12.bin

In extraputty go to "File Transfer" and **Xmodem 1k --> Send **

Choose: c2960-lanbasek9-mz.122-55.SE12.bin

Wait a while, at 115200, it'll probably take 20 mins-ish
Once successfully transferred:

boot flash:c2960-lanbasek9-mz.122-55.SE12.bin
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