Arduino nano ch340 upload problem
This is a very commonly faced issue in products with CH340 chip. First check whether you have installed the CH340 driver on your device. The product won't work without the drive. If you are facing the issue even after the driver installation check which Atmega version you have selected, Always select the old version. Press the RST button while uploading the code and release. Hope this will help you to resolve the issue.
If still the problem is not resolved then replace your Arduino
If still the problem is not resolved then replace your Arduino