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Delete CH340 series serial number
Pl2303 driver /ch340 usb to serial port driver

1. Search for the following three files (run the installer first)

ser2pl.cat? 1 1,085 2007-02- 14? 03:38

ser2pl.inf? 2,847? 2007-02- 12? 17:53

ser2pl。 PNF? 9,2 16? 20 10-08-24? 12:0 1

Paste them into c:\windows\inf.

Step 2 search for files

July 20(th), 2009

Paste it into c:\windows\system32\driver.

3. Just plug in the USB again.

Second, the installation instructions of ch340 usb to serial port driver

1.? Delete the existing driver.

2.? The USB serial port is plugged into the USB port.

3.? The computer will prompt you to find new hardware.

4.? Select manual installation.

5.? The installation path points to this folder.

6.? Click Next until the installation is complete.