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I'm new to Arduino, and I recently got 3 off-brand Nanos, and soldered pins for all three.

Initially, none worked (I always received avrdude's errors when uploading).

Based on my research, I realized that one of them probably doesn't have a bootloader (whatever that means) because when I hit the reset button, the LED labeled "L" doesn't blink.

Continuing on with my research, I tried changing my processor (in the Arduino IDE) to ATmega328P (Old Bootloader). Now, the second Nano is working problem-free (everything is uploading correctly).

But there is a problem with the third Nano. When I upload an example program (such as "Blink"), the Arduino IDE outputs the following error:

Arduino: 1.8.9 (Windows 10), Board: "Arduino Nano, ATmega328P (Old Bootloader)"

Sketch uses 930 bytes (3%) of program storage space. Maximum is 30720 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avr_read(): error reading address 0x0000
    read operation not supported for memory "flash"
avrdude: failed to read all of flash memory, rc=-2
avrdude: stk500_recv(): programmer is not responding
the selected serial port avrdude: failed to read all of flash memory, rc=-2
 does not exist or your board is not connected

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

But somehow, the Nano is functioning correctly! The LED is blinking as it should. I confirmed that it is executing the "Blink" program by changing the blink rates, and it's working. But every time I upload, I receive that error. Does anyone know why?

Please note that this isn't a problem with me selecting the wrong COM port; I've tested it multiple times and confirmed that it's the correct port.

  • probably doesn't have a bootloader means that you cannot upload via serial/usb... you should increase the verbosity during compilation and upload, this might reveal some helpful info. – Sim Son Aug 25 at 11:41

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