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 architecture that combines Atmel microcontroller family with standard hardware into a board with inbuilt bootloader for plug and play embedded programming.Arduino Softwarecomes with an IDE that helps writing, debugging and burning program into Arduino. The IDE also comes with a Serial Co...