The behavior of the built-in LED is reversed to the one on an Arduino. On the Seeed Studio XIAO SAMD21 , the pin has to be pulled low, whereas on other micro-controllers it has to be pulled high. If that does not work, please try to enterbootloader mode: ...
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino is an architecture that combines Atmel microcontroller family with standard hardware into a board with inbuilt bootloader for plug and play embedded programming. Arduino Software comes with an IDE that ...