Dear Customer, please check the switch back to uart and choose the higher com port as the COM during downloading program. By the way, if you face Error code:1011 (5%) during the firmware downloading, please press the reset button. it will work well. for more info, please refer to <LINK_TEXT text=“https://docs.labs.mediatek.com/resource … s-firmware”>https://docs.labs.mediatek.com/resource/linkit-one/en/getting-started/get-started-on-windows/update-your-boards-firmware</LINK_TEXT> thanks. Seeed Techsupport Team.