Follow the instruction on the website use a 126GB SD card, write the image to it, plugged the card in as well as mouse, keyboard internet and monitor. The item start to boot and it took about 30, after that, it is totally black on the screen for over an hour, no video signal. Repeat the image and all procedure few times, no video signal just a small green LED.
For any boot problem, if you didn’t try sdkmanager before, I would suggest try it first.
It is different from flashing sdcard only.