Family Software Newsletter #37 - April 7, 2012 (Updated 4/7/14)

Drag Racing Computers and Software - www.iFamilySoftware.com

Topic: USB to Serial adapter driver issues

Windows 8/7/Vista/XP - Prolific PL-2303 Driver Fix (VID_067B&PID_2303)

"This Device cannot start (Code 10)"

"No driver installed for this device"

"Device driver was not successfully installed"

The Internet is full of web pages on this problem, but no one seems to know what causes it. Even the companies selling these USB to Serial adapters appear to be completely confused.

What appears to be happening is that there are a ton of counterfeit "Prolific" chips coming from China and getting the correct driver installed is like playing Russian roulette. The counterfeit chips use the same Vendor ID (VID) and Product ID (PID) as the authentic Prolific chips. Prolific talks about this on their web site and I'm betting they are as frustrated as we end users.

The drivers that Microsoft supplies via Windows Update, Versions 3.4.25.218, 2.1.51.238, and 3.4.62.293 will not work with most adapters and issues the generic Code 10 error. If your adapter was working prior to going to Windows Update, you can "roll back" to the previous installed driver and all will be well once again. However, if you didn't have a previous driver installed that worked, you'll have to go through the process of removing any PL-2303 driver installation programs,the actual driver files, and the information (.INF) file BEFORE you are able to successfully install the correct driver. What aggravates the issue is that there are many "Prolific Driver Removal Tools" that do not work properly as well! So, no matter how many times you remove the driver files and reboot, the next time you insert the USB to Serial adapter, Windows installs the wrong version again. Yes, it's frustrating as hell.

The only driver I have ever found that works with all the "Prolific" adapters is Version 3.3.2.102, and the only proper Driver Removal Tool comes from Prolific Technology itself.

This Fix is for:

- Windows Vista (32 & 64 bit)
- Windows 7 (32 & 64 bit) .
.Prolific USB to Serial Adapter .
.Device using PL-2303 H/HXA/HX/X version chips
.Supported device ID and product strings: . VID_067B&PID_2303 for "Prolific USB-to-Serial Comm Port"

1. Download the compressed file folder, "USBDriverFiles.zip" at this location:

http://www.ifamilysoftware.com/Drivers/USBDriverFiles.zip

You can just Save it to your Desktop if you like. Open the folder and click on "Extract" to uncompress the individual files.

2. Unplug any PL-2303 devices.

3. Next, go to the Windows Control Panel "Uninstall a Program". Remove any PL-2303 Driver Installation Programs found there.

4. Reboot your computer

5. Run the "PL2303DRemover.exe" program to remove the old drivers and .inf file

6. Reboot your computer

7. Run the "PL2303_Prolific_Vista_332102.exe" program to install the new drivers

8. Plug in your USB to Serial adapter, "Your device is ready for use"

Key words: Sabrent, SBT-USC1M, Prolific, PL-2303, USB to Serial, VID_067B, PID_2303, Code 10

-- REAL World Technical Support --
With Family Software, you'll get better technical support than anywhere on the planet. Why? Because, we design and/or use all of the products that we sell. All of my 40+ years of on-track racing experience and knowledge is available to you. Try to find that kind of information at any one of our competitors. You won't be able to, I guarantee it! Family Software cares about the racer and his/her success as a racer. We also want you to get the most value for your hard earned dollars.

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Bob Kodadek

SC 1596
Family Software - Drag Racing Computers and Software
http://www.iFamilySoftware.com - 610.497.5561(Voice/Fax)


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