Hello! i'm newbie need your help! just received my Nyboar V1 (included bluetooth dongle) . after connect to BittleBLE-35353E (bluetooth dongle ), i can't upload test code to Nyboard. One leg of serial interface was missing . is this nomal ? video show Bluetooth dongle led blinking. i'm nood so and you help me ! and the last question is : what's a meaning of each Led indicator ( 7 of theme ) Thank you