Copy downloaded zgemma folder to a fat32 formatted usb stick. Put stick in back of box, turn on using rear power button, when display on front shows usb press front power button - display should change to FLA5H. If it doesn't and goes straight to boot try another USB stick or use HDDGURU and do a full format of the stick followed by a windows full format. USB stick needs to be 32gb or less to flash the box (my experience is 4-16gb and decent brands are best for flashing)