Paula, I hope your mini has already recovered. If not you should be able to trigger a factory reset.
This is what is happening: The rcS file is called each time the reader is powered on. It creates the necessary environment and starts finally nickel. I modified rcS in order to call the menu tool. Since you deleted the folder containing the menu tool, the rcS script breaks when attempting to call the menu tool, and cannot start nickel. At this point only the OS is running, there is no mechanism to interact now via touching the screen. But you should still be able to power off.
1) push the power slider to the right side and hold it for 20 seconds
2) hold the reset button and push the power slider to the right; hold both until the led becomes red.
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