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#Prolific usb to serial comm port not working install
#Prolific usb to serial comm port not working manual

Connect IS02 to an USB port of the PC with a USB cable.

Also it is important that you always use one dedicated USB port on the PC for IS02 devices.

#Prolific usb to serial comm port not working install

The key point is to install the old driver and use “Device Manager” to update to use the old driver. The following steps describe the whole process. If you get a new Windows 11 computer or have upgraded to Windows 11, you need to manually install USB driver and use “Device Manager” to setup the driver. Windows 11 USB default driver DO NOT work for Inspirstar devices.ĭO NOT UPGRADE PC from Windows 10 to Windows 11 if not very necessary.

After the new driver is installed, the driver version will be 3.9.1.

Before it’s available from Windows Update, this new driver can be downloaded from here link ( After downloading this file, follow the instructions on the screen, and choose to Run Anyway if you are asked whether to continue. We expect Windows 11 to use this new driver version in the next Windows update.

#Prolific usb to serial comm port not working manual

The IS02 devices shall work when plugged into a Windows 11 computer without any manual driver update.Ī new driver version has been released to fix the issue on the previous release for Windows 11. The new working driver is now included in the Windows 11 update.

*Except it is old IS02BA unit AND your USB adaptor was old Gen1. If you plug in Inspirstar IS02 devices to your Windows 10 computer for the first time, Windows 10 will automatically install USB driver for the device and it should work instantly. Windows 10 default USB driver works for all Inspirstar IS02 devices*.