Arduino Nano unstable sketch loading - what do experts advise?

Question

Arduino

Good day Dear - tell me where to dig. The Chinese Arduino nano scarf came - a problem with downloading sketches, not that it doesn’t load at all, but it loads unstable, sometimes every other time, then 5 times. Built on CH340C,
In addition, I use Arduino UNO, there are no problems with it, the same CH340 and sketches are loaded there with a bang and it works stably. (I mean that the driver is installed, the port is determined, and when changing boards, I change the type in the tools boards) How to check what is unstable - CH340 converter or controller?

Answer 1

Once my board began to flash unstable, I decided to solder the microusb connector.

Answer 2

The missing contact and soldering have already been suggested.
I will add a second option for the kit - a contact where it is not needed. Treatment by washing in alcohol. I somehow helped one arduino.

Answer 3

If you continue to deal with electronics, then I can advise this:
Sometimes it’s easier to throw it away and buy a new one, you shouldn’t zealously try to fix everything