However, there is a problem when I try to upload the Bootloader, it says "ser_open(): can't open device "unknown"", and the uploading fails. How can I fix this? Thank you.Author Yucheng-L commented Jan 2, 2017 Blow is the message I got. I am using Arduino UNO as programmmer....
Recently I have bought acheap clone of Arduino Nanofrom the Chinese site Deal Extreme. Unfortunately, that product (SKU 81877) comes without a bootloader. The main sign that indicates you that the Arduino doesn’t have a bootloader is that the “L” LED, next to the Power LED, doesn’...