I've checked all wire connections and cleaned all corrocsions.
When I disconnect the back from its body, it still boot up like this. It seems the back circuit board (with some samsung memories, sd card and usb sockets) doesn't communicate with the motor driver board. Perhaps that's why I can't reflash the system with an sd card. It doesn't read sd card at all.
That's all it can do. After power up dance, there is no sound, no leg movement and no mode change. Only very limited upper body actions. LCD screen is stuck at 'wowwee' splash.
BTW I'm new to this robot. What is serial port hack? I've seen alot of people talk about it. but it seems there's no clear explanation. Please can anyone explain what it is and how to do it. Thanks