Cameteo/circuitpython/code/boot.py

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# Selectively setting readonly to False on boot
import board
import digitalio
import storage
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jumper = digitalio.DigitalInOut(board.D5)
jumper.direction = digitalio.Direction.INPUT
jumper.pull = digitalio.Pull.UP
led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT
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# If the jumper on D5 is connected
# CircuitPython can write to the drive
storage.remount("/", jumper.value)
led.value = jumper.value
print("Read-only:{}".format(jumper.value))