For some reason, my IDE has stopped uploading code to my Arduino Nano (on COM3). The error message is:" arvdude: stk500-getsync() attempt 1 of 10: not in sync: resp 0x00". I get this 9 more times then the message: "an error occurred while uploading the sketch". It appears the my laptop/IDE cannot get in sync to data transfer with the Nano. I have tried (1) going through the Arduino/en/Guide/troubleshooting#upload… good material, but not helpful in this case (2) re-booting my laptop and resetting the Nano. (3) trying a different cable and (4) unplugging everything and plugging it back in. This is about the extent of my ability to solve this type of problem. My Windows 10 task manager says USB serial CH340 (COM3) is working properly. My system has been working correctly until yesterday.Any suggestions you have for a solution will be greatly appreciated.rickir206
Choose 328 old bootloader from the boards / chip menu and retry, report back.
I realized the Pro Mini is a retired board which could be the problem.
where do I find "the old bootloader" in the IDE?
So, it looked like I can upload using the Uno setting.
Several monitors (spycatcher2k, SandroMesquita, and DrAzzy (my thanks to all)) replied to my post. A combination of their suggestions worked for me. This is what worked: (1) I tred uploading with "dueinalove" selected as the board. This does not make it work, but the system assigned a new COM port number to the board (COM6 in my case). I went back and change the board back to a Nano. Now had the Nano on Com6 rather than the non-working COM3. I then went to boards/chip menu and selected from bootloader "Arduino 328 (old)" (or something like that, I don't have it in front of me right now). With the Nano on a new COM port and the old bootloader, everything works great. Note: for all I know, it might work with the newer bootloader also...I just didn't try it. Hopes this helps. rickir206