How to flash Arduino through soft serial?

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allObjects
@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?

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user111618 in reply to @allObjects

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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