Verify the connectivity of accessories on the motherboard, plug the power adapter into a live socket, then connect USB, or press the button as shown on the photo for 3 seconds, development board will be booted automatically.

If you connect LCM module or external display devices, the screen display will appear to be the same as Android.

A bnormal booting and restarting loop

Maybe out of battery, please use power supply with 12V (voltage), 2.5A~3A (current) to charge.