Mini USB CH340 Nano 3.0 ATmega328P Controller Board Compatible For Arduino Nano CH340C USB Driver Nano V3.0 ATmega328

Under the premise of ensuring the performance of NANO and the main control chip ATMEGA328P-AU unchanged, we replaced the USB chip, improved the download speed, and increased the stability in win7 win8. Instructions: 2. Download the USB chip driver  3. Plug in the NANO development board and the driver will be installed automatically. 4. Select the board in the die NANO 5. Select the COM port, this can be queried in my computer, just the port inside your uno development board 6. It is best to choose, NANO's own routine program, burn it in.