• @user111618, you want to use an Espruino (driven) device to

    • 1st) store hex data in its flash
    • 2nd) flash an Arduino with that hex data

    Is that what you want?

  • Yes. Cause Espruino(ESP8266) can not generate 38KHz PWM to drive an IR LED, so I have to use Arduino to do this. But for some reason I'd like to change Arduino firmware, like when I put those MCUs into a box.

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