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I was trying to reset a password that I had forgotten on a cisco 877. Standard procedure is to turn it off, wait 5 seconds, turn it back on, and hit the Break key. However, I use minicom to access my cisco devices over serial cables, and this did not work. It took me a while to work out that, because I was using minicom, I needed to send it 'ctrl-A' and then 'F' instead (it will display "sending break" if done correctly).
Just a reminder to myself really, and here in case someone finds this via google.