You will need the firmware file (often provided via download link or CD) and the Amlogic USB Burning Tool (UBT) USB Male-to-Male cable is required to connect the STB to your computer. Connection:
dd if=/boot/u-boot.bin.emmc of=/dev/mmcblk0 bs=1 count=444 dd if=/boot/u-boot.bin.emmc of=/dev/mmcblk0 bs=512 skip=1 seek=1 realunix pro hg680p install
Use BalenaEtcher or Win32 Disk Imager. Select the .img.xz file and your SD card. You will need the firmware file (often provided
Amlogic S905X has a hardware RNG. Load the driver: realunix pro hg680p install