Many of the Chinese Nano, in addition to using CH340G chips as their interface, do not come with the Arduino boot-loader installed. These need to be loaded via the ICSP pins before they can be programmed via the IDE.
Many of the Chinese Nano, in addition to using CH340G chips as their interface, do not come with the Arduino boot-loader installed. These need to be loaded via the ICSP pins before they can be programmed via the IDE.