Please tell us which USB to serial bridge chip this board has. It is the largest black chip on the bottom of the board.
The chip will usually be identified by writing on the top. This might say something like "WCH CH340G" or "FTDI FT232RL".
Examples:
WCH CH340
FTDI FT232R
Microchip ATmega16U2
If it isn't clear, alternatively you can provide the link to where you bought the board from and we'll see if we can determine the chip from the product listing.