Review on KOOKYE Nano V3.0 ATMEGA328P Module CH340C 5V 16M Mini USB Micro-Controller Board for Arduino (Nano5) - Enhanced Performance and Connectivity by David Pearson

Already bought twice. I've read that several people mention the risk of getting a non-working board for other products. Find it great and no problems. There was a command in the customer comments for their firmware that I ran several times on my Mac, something like this: avrdude -c avr109 -p atmega32u4 -P /dev/cu.usbmodem1 -U flash:w:filename. hexGround pin 3 and when it starts blinking you should see /dev. It should be noted that sometimes it didn't release the device, so when resetting it incremented the device with a counter like modem1.modem2.modem3. That means you need to quickly check the new device name or guess the next number. If you don't flash it after a few seconds, you'll have to try again. If you're using the Arduino IDE or a more modern build approach that expects a reset, don't worry. I used them in the keyboard experiment I'm writing this review about.