I had the same problem, but i was using minicom(as against putty) within a terminal window on a linux graphical desktop. No matter what I pressed the autoboot couldn't be halted(even though the terminal displayed all key-presses).
By running minicom on one of the text-only TTY sessions, I was finally able to see the effect of key-presses over the serial connection(i.e. stop autoboot, run commands etc ). Hope this helps someone stuck similarly.
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