If you do not have a capacitor available, you can also try to set the "Upload Speed" to 115200 in Arduino IDE.
Of course the uploads are longer, but it did the job for me : i did not have any upload error since

I also installed the latest CP210x Windows driver (v10.1.1 for Windows 10) but i don't think this is necessary

If you do not have a capacitor available, you can also try to set the "Upload Speed" to 115200 in Arduino IDE.
Of course the uploads are longer, but it did the job for me : i did not have any upload error since

I also installed the latest CP210x Windows driver (v10.1.1 for Windows 10) but i don't think this is necessary