To boot the system for the first time you have to use one from the following methods, sometimes only one of these methods will work! dtb image file for your device to the root folder of the SD card / USB flash drive, and rename it to dtb.img.
Use Rufus, usbimager (or your preferred image writing software) to burn the downloaded image file to your SD card / USB flash drive.NOTE: On some devices, only 1 USB port is able to boot the device, you may have to try them all to see which one works for you, some boxes are also unable to boot from a USB drive. Prepare an SD card (class 10) / USB flash drive as follows