1. Power off the unit,
  2. Press “Mode” button and keep it pressed for 2 minutes while putting power back on
  3. To confirm that it’s working, you should get at the prompt “switch:”
  4. Enter the following command “flash_init”
  5. Enter the command “dir flash:” to see flash card content
  6. Rename the file config.text with the following command : “rename flash:config.text flash:config.old”
  7. Launch the IOS with the command “boot”
  8. Press “n” at the question to enter initial configuration wizard
  9. You now have a factory reset switch, if you got good backup of the config and that default config are fine with you simply save running config in the flash with the following command : “copy run flash:config.text”
  10. There you go !
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