I want to inquire about wireless sketch uploading to Arduino boards.

  1. Are there any reliable and easy modifications that would not risk permanent damage to the Arduino and preferably, be reversible?

  2. Are there any ready-made Arduinos that natively support OTA updates? I've seen this on ESP8266 and ESP32 but i would like to stick to Arduino.

  3. If an Arduino has more than one serial port, shouldn't it be able to natively support wireless sketch upload? For example, the Arduino MEGA can have a Bluetooth module connected to one serial port and another serial port for uploading code?

  4. I am using a Bluetooth HC-05 module with Arduino UNO - is it possible to upload Arduino sketch directly using the Bluetooth connection? I am able to send and receive serial data wirelessly, but sketch update via Bluetooth is not working.

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