I have Arduino Nano v3.1 clone
blink sketch ( 1000ms delays ) example gives 4 sec led on an 4 sec led off
I suspect MCU runs 4MHz frequency.
What board/setting should i use in Arduino IDE ?
Did you manage to upload to that board? If yes, it will also require a different bootloader from the normal ones. Which one did you use?
You will have to create your own board settings for that. The file to modify is boards.txt (if not mistaken); note that there might be multiple of them and if you modify the wrong one the changes will not reflect in the IDE. Close the IDE before making the changes.
I can't help you with the exact details. Look for Nano in the file, copy the section (e.g "old bootloader" and modify to your needs.
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