Loading IOS on a switch or router via the console
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If the flash has been deleted / formated and there is no IOS on the switch or router, you have to copy the new IOS via the console port.
All you have to do is to type: copy xmodem: flash: and hit return in the rommon or enable mode.
After that klick on File in your Tera Term or Hyperterminal Software and on Send File in order to select the IOS from your directory.
Make sure you checked the Binary button.
This might take very very long or even very very very very long depening on the size of the IOS you are loading.