AML-S805X-AC help

Hi, I’m new to the forum.
I am trying to use AML-S805X-A, I connect a cable to the Micro USB of the AML-S805X-A to give it power directly from my computer with the USB. And two lights come on, one red and one green, I don’t know what it means…
I have tried flashing a USB and connecting it to update the firmware but I don’t know if it is doing anything. I connect the screen to HDMI and nothing can be seen… I don’t really know how to continue…
I would like to put an operating system on it… if anyone can help me I would appreciate it, greetings.