Arduino Nano ch340 flashing Troubleshooting
Today, some weird things happened.
All of my arduino nano weren't flashed!
So, I tried to figure out what happened.
it turned out the Arduino IDE 1.8.5 has 2 different version(?) of Processor of ATmega328P
I wasted 1 hour to figure out this.
summary
summary
If you cannot flash copied (CH340) Arduino nano, check the processor.
ATmega328 (Old Bootloader) must be checked!
ATmega328 (Old Bootloader) must be checked!