https://www.instructables.com/id/How-To-Burn-a-Bootloader-to-Clone-Arduino-Nano-30/
https://www.youtube.com/watch?v=vYLjDQKnapo

I have recently purchased an Arduino Nano 3.0 Clone which came without a bootloader. I am sure there are many other people who are in the same situation as me, and may have freaked out a little bit at first ! Don't worry, in this instructable I will show you how to easily install a bootloader to your new clone.

let's see how it's done..>

ATTENTION - some clones are different. they don't have an ftdi chip, which may cause your computer to not see the arduino once plugged in with the usb. if this is the case, please follow these steps; https://www.instructables.com/id/How-To-Burn-a-Boot... thanks to author Gegec for his help on noticing the problem and solving it as well :)