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I was able to get a RUNME.sh in there by with a "cat > /mnt/us/RUNME.sh" followed by the text of RUNME.sh, during a few second window during bootup over serial. I was also successful when the USB mounted drive appeared (not just the zero-length version) for a fraction of a second during boot. In both cases, it helps to have a script on the host sitting waiting, or in the USB drive case continuously looping, ready to pounce at the first opportunity. Before we had newer better ways to debrick kindles (starting with my "Select Boot" utility, both of those (narrow window of opportunity) methods worked to varying degrees.
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