Upload Arduino sketches to boards with MicroPython firmware [HC-1626] (#477)

* Create Upload-Arduino-sketches-to-boards-with-MicroPython-firmware.md

* Fix intro + title

* Some refinements

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Co-authored-by: seaxwi <[email protected]>

Author: gorillagripcore

content/Hardware Support/Generic/Upload-a-sketch-to-a-board-running-MicroPython.md

@@ -0,0 +1,43 @@
+---
+title: Upload a sketch to a board running MicroPython
+---
+
+Uploading a sketch to an Arduino board running MicroPython is straightforward. You don’t need to manually uninstall MicroPython—uploading a sketch automatically replaces the existing firmware and restores the board’s standard Arduino functionality. If you’d like to switch back to MicroPython, simply [reinstall the MicroPython firmware](https://support.arduino.cc/hc/en-us/articles/15156644171548-Upload-firmware-for-Arduino-Lab-for-Micropython).
+
+Boards with MicroPython support:
+
+- Arduino GIGA R1 WiFi
+- Arduino Nano 33 BLE
+- Arduino Nano 33 BLE Rev2
+- Arduino Nano 33 BLE Sense
+- Arduino Nano 33 BLE Sense Rev2
+- Arduino Nano ESP32
+- Arduino Nano RP2040 Connect
+- Arduino Nicla Vision
+- Arduino Opta Lite
+- Arduino Opta RS485
+- Arduino Opta WiFi
+- Arduino Portenta C33
+- Arduino Portenta H7
+- Arduino Portenta H7 Lite
+- Arduino Portenta H7 Lite Connected
+
+---
+
+Follow these steps:
+
+1. If Arduino Lab for MicroPython is running: Disconnect from the board, or close the application.
+
+1. Open an Arduino development tool that support sketch uploads, such as Arduino IDE or the [Arduino Cloud Editor](https://app.arduino.cc/sketches/examples?nav=Examples&eid=01.Basics%2FBlink){.link-external}.
+
+1. Select your board. If it doesn't appear, set your board to **bootloader mode** by double-pressing the reset button.
+
+   - The board is in bootloader mode when the LED pulses slowly in green[^colors].
+
+   - _If you're using Nano ESP32:_ If the bootloader mode won't activate, try adjusting your timing, waiting 0.3 to 1 second between each press.
+
+1. Upload the **Blink** example, or any other Arduino sketch, to restore the standard Arduino bootloader.
+
+   - In Arduino IDE, select File > Example > 01.Basics > Blink.
+
+[^colors]: On some earlier versions of the Nano ESP32, the LED will be blue instead of green, and yellow instead of purple.