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You're on the right track, but the timing can be tricky.
Personally, I hate anything requiring coordination.
I think that I've had luck pushing it a bit faster than once a second.
Except that you don't know when it starts counting.
So do it as soon as you release reset and keep on doing it.
abl (used to?) has something that detects keystrokes on the internal UART line.
But it needs fifty keystrokes at the right time.
I finally wrote a program to read the UART TX to get the timing correct.
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