Dec 21, 2020 • Filed to: USB Recovery • Proven solutions

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6. Drivers Elinchrom Port Devices Download

• Download the latest drivers, software, firmware, and diagnostics for your HP products from the official HP Support website.
• Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC. Application software can access the USB device in the This page contains the VCP drivers currently available for FTDI devices. For D2XX Direct drivers, please click here.
• On Windows 10, a device driver is an essential piece of code, which allows the system to interact with a specific hardware (such as graphics card, storage driver, network adapter, Bluetooth, etc.
• DriverStore is a new and a central location in Windows Vista and Windows 7 where all the driver files will be stored., before they are copied to their final destination during the device driver installation. The location of the driver store is – C: Windows System32 DriverStore.

Have you ever had difficulty connecting your devices to your computer using a Prolific USB to Serial adapter? If yes you are lucky to find this page, it will give you all the information need to fix an unresponsive Serial driver adapter. You may have noticed a yellow exclamation mark hovering over or beside the USB to Serial Driver when searching your Device Manager and if you have we can all agree that it signifies a prevailing problem.

Installation of the EL-Skyport USB RX driver was successful. The COM port emulation driver must now be installed. Click 'Finish' to complete the installation of the serial converter and proceed to the 8. Under Windows 98, the COM port emulation driver will be automatically installed from the same location as the EL-Skyport USB RX driver.

Overview of the Error

If you are not able to connect your device to your PC using a USB to Serial adapter it may be that

• The USB driver is outdated
• The USB Driver is missing
• Or even a corrupted driver

While you can't be so sure what the exact problem is there are solutions you can adopt to fix the issue once and for all. Read on to find quick fixes to resolve the problem.

1# Fix Prolific USB to Serial Driver not Working

Solution: Roll your Prolific USB to Serial Driver back to an older version

Updating your drivers often work wonders for your system because it makes sure that it runs on the latest features that guarantee maximum functionality. Unfortunately updating your drivers can cause this kind of error especially if your latest update does not work too well with your hardware. Once you upgrade your PC to the latest Windows version your Prolific USB to Serial Driver also updates to the latest driver software and if the driver is not compatible with your Hardware issues may arise. To correct the error, you will have to download the driver again by following these steps.

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• Right-click on your PC Start button and open Device Manager

• Double click LPT and COM ports then locate the Prolific USB to Serial Driver and right-click it so you can select Update Driver

• For driver software click My computer

• From My computer select 'Let me pick from a list of drivers available'

• Choose an older version from the list then click Next

• The driver you selected will be installed automatically
• Once it has been downloaded reconnect the driver to see if it works.

2# Fix Prolific USB to Serial Driver 'Coder 10'

Driver issues reveal themselves in so many ways or through messages such as

• This device will not start (Code 10)
• There is no driver installed in this device
• The driver was not successfully installed

A code 10 error may arise because the chip you are using is not an original one. If you are using a fake, the manufacturer has a way of disabling it due to copy write infringement and the copy write takes effect once you download a recent update. To protect your PC from getting this code, you will have to make sure that your Windows 10 never updates a driver without approval. Updates come in the form of 64 bit and 32-bit drivers. Below we will show you how to work your way around the problem.

Window 64 bit Fix

To fix Windows 64 bit OS including Prolific USB to Serial Adapter, follow through these steps.

• Download 'PL2303_64bit_Installer.exe and Save
• Remove every USB to Serial adapter from your PC and double click the 'PL2303_64bit_installer.exe
• Follow the prompt by plugging in one USB to Serial adapter the click on Continue
• Reboot your PC to get Windows up and running

If you have followed these process through and you still see the same error go to your device manager

• Open the control panel and navigate to Device Manager
• From your control panel navigate to the System category and click the Hardware tab
• Scroll to the LPT/COM port and double click Prolific USB to Serial Comm Port
• Click Drivers in the Properties section
• The Driver you choose should read '3.3.2.102 with an appropriate date attached
• If the date is wrong then it means the wrong driver was installed
• Unplug the Serial adapter and run the steps again to install the correct driver

Window 32-bit

For Windows 32-bit OS systems follow these steps

• You will have to download the 'PL-2303_Driver_Installer.exe and save from Microsoft download link
• Run the program and eradicate the driver if you can
• Run the installer once more to install a correct driver

To Troubleshoot for error if your device still does not work

• Go to Control panel, enter System to access your Device Manager
• Scroll down to the LPT/ COM port then double click Prolific USB to Serial Comm Port
• Click Driver in the Windows Properties section
• The driver must be numbered as '2.0.2.8' and dates accordingly

If the driver was not installed, remove the Serial adapter then run 'PL2303_Driver_Installer.exe' again. Follow directions in Device Manager to download the correct driver

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The three solutions listed in this article have proven to be quite helpful in fixing a Prolific USB to Serial driver not working on Windows 10. They may appear confusing at first but if you follow each step in detail you can resolve the issue.

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Each time when you connect a new COM device or a USB device (true for modems, smartphones, Bluetooth, serial-to-USB converters, etc.), Windows detects it using Plug-n-Play and assigns it some COM port number in the range of 1 to 255. If this device is connected again, the reserved port is assigned to it. A new device gets the first free COM port number. It often occurs that, when being connected, the external devices create several COM ports at once. In my case after connecting a Bluetooth adapter 10!!! new COM ports has appeared in the system.

A number of applications (quite obsolete, as a rule) are able to address only two-digit COM port numbers and won’t work with COM100 or higher. In the worst cases, these programs work only with COM1-COM9 ports. What if a device has got a higher number? Could the numbering scheme of the reserved COM ports be reset and the assigned ports be deleted? Let’s try to deal with it in Windows 7.

As a rule, you are not able to change the assigned COM port in the hardware properties, since the system says that all “lower” COM ports are already in use.

How to Change a COM Port Number for a Specific Device

First of all, try to reassign the COM port number for a specific COM device manually. Suppose that the necessary COM port is already busy and we would like to free it.

1. Start the Device Manager as follows:
   set devmgr_show_nonpresent_devices=1
start devmgmt.msc
   
2. Select View->Show Hidden Devices in the console menu.
3. Expand Ports (COM & LPT) branch and find the device, which is assigned the necessary COM port in the list. (A pale icon means that this COM port is already assigned, but currently the device is not connected) Right-click it and select Uninstall.
4. The freed up COM port can be assigned to another device. Find your device in the same branch, and open the Properties window. Then go to the PortSettings tab and click Advanced. In the dropdown list, select the free COM port.

This method is not always useful in trying to free up a busy COM port. Then you will have to make some changes to the registry.

How to Reset COM Port Binding Using the Registry

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The information about busy COM ports is stored in CommDB registry key in HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlCOM Name Arbiter section.

• Open the Registry Editor (regedit) and go to the branch mentioned above.
  Important! We strongly recommend to back up this registry branch (File -> Export) before doing anything. If something goes wrong, you can get back to the original port configuration.
• The value of ComDB parameter in the binary format determines the list of COM ports reserved in the system. Each bit determines the state of the corresponding port (from 1 to 255). For example, if you need to leave the reservation only for COM3, the hex value of ComDB is equal to 04 (0000 0100)
  
  Important! Be very attentive, and don’t add any additional bits to the parameter, or the system will display the BSOD.
• If you have to reset all COM port bindings, change the value of ComDB to 0.
  
  Note. In HKEY_LOCAL_MACHINEHARDWAREDEVICEMAPSERIALCOMM section, you can see the list of COM ports connected to the system.
• The HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionPorts branch contains the list of all assigned COM ports. All unnecessary ports may be deleted. In our example, we’ll leave only COM3 and delete the rest ports.
• Unplug all external devices and restart your computer.
• After the restart, connect the devices in the necessary order. (Reinstall USB-to-serial converters, etc.) All COM ports found by the system will be automatically identified by the system and assigned the COM port numbers one by one.

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