l/package_rp2040_index.json Note: If you already have the ESP8266 board URL, you can separate the URLs with commas like this: https://dl.espressif.com/dl/package_esp32_index.json,https://github.co m/earlephilhower/arduino‐pico/releases/download/global/package_rp2040_i ndex.json 3. Click on Tools -> Dev Board -> Dev Board Manager -> Search for pico, it shows installed since my computer has already installed it.