OrangePi 4G-IOT doesn't boot

mrz.to

I bought a 4G-IOT kit with its LCD touch.
Android should be preloaded, so I connected the screen (not the camera) and power supply (5V 2.5A).
Red led on, screen is black: ok.
Holding down reset button, green led goes on and lcd's backlight glows: ok.
Nothing appear on the screen, and after several second screen goes off...
... operating system is missed? could this be the cause?

admin

Pls donwload the Android images for OPI 4G-IOT and then reburn it to check, it shall workhttp://www.orangepi.org/download ... 2b03c9ddb37ac7.html