Edit 'nano_programmer.py' and change COM6 port to the one which your Arduino is using. Edit 'makerom.py' to your liking. It's setup so it only creates 1024 bytes for faster programming (whole 32KB ROM ...

The Arduino Nano uses the 74595 ICs to send the address and output enable signals to the EEPROM chip serially, and then latch them into parallel outputs. This way, the Arduino Nano can send commands ...

Assuming the Arduino Nano clone isn’t using an amazingly high-quality EEPROM we can safely assume that most of us have nothing to worry about and our Arduinos will be functional for decades to come.

One option is of course to purchase an UPDI programmer, but an even better solution was to make a DIY USB version from nice, cheap parts. Programming an Attiny404 over the UPDI interface.

The Nano ESP32 supports both Micropython and Arduino programming languages, providing a clear path for those already familiar with one platform to easily switch back and forth as needed.