https://dccwiki.com/Can_I_update_the_DCC%2B%2B_EX_installed_the_Arduino_board_using_WiFi%3F FAQ:Can I update the DCC++ EX installed the Arduino board using WiFi? - DCCWiki

FAQ:Can I update the DCC++ EX installed the Arduino board using WiFi?

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Short answer: No

The WiFi device connected to an Arduino board has it's own uCPU that cannot reprogram the Arduino board. The Arduino board will be programmed using a USB connection.

Note: Some WiFi chips can update their own firmware/software from the internet, but it cannot update the Arduino board.