I follow the google web page about the VIM3L fastboot step.
After Try ALL DAY…
It always not response during the super.img.
Although I use the USB port on the back of the computer motherboard for power and even replace the 3 adapter. It’s still not work.
…
I’ve never seen this happen in other development board.
https://source.android.google.cn/setup/build/devices?hl=zh-cn