Hello, I received recently an Helios64 from a new friend, However, when I get home, I plug it in, turn it on (already I have to press the power button for 4 seconds to get some life) and I get the following LEDs lit up: - LED1 - LED2 - LED3 - LED5 - LED6 i got nothing on the serial line (tested on MacOS and Windows), and no reaction when I do quick and long press on Recovery nor Reset.   Is there some electronic schematic that could help me to de