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You already know which terminal out of the device is TX because you can read the log off that.
So leave that connection alone, because it's not the one that you can send data down and also you can't see what's happening.
Just add the extra connection.
On my Poke3 I can see that the boot sequence pays attention to "rubout" (0x7f). Putty maps this to the "backspace" key.
In any case the device TX is your eyes and ears.
Try with backspace, arrow keys, space bar, delete key...
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