Its value of 1 indicates that denying the listed device IDs is enabled. If you then navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DeviceInstall\Restrictions you should see the new items.įirstly, the DenyDeviceIDs name under the Restrictions key. Right click the pl2303.reg file and select Merge. If it’s wrong, follow the instructions in the previous post to make it right. In Device Manager, it should look like this: You might need this later.ģ Confirm the working PL2303 driver is installed Make a backup of the DeviceInstall key by right clicking and selecting Export. You will need to renumber the hardware ids in your pl2303.reg file so they don’t overwrite the devices that are already listed under the DenyDeviceIDs key. If these are already set to something else, you will be interfering with existing configuration and it is up to you what you do with it. You must have DenyDeviceIDsRetroactive set to 0 or not present to prevent Windows from removing the existing device with the older, working driver. You must have DenyDeviceIDs set to 1 for the policy to work. Otherwise, you’re going to have to merge the changes into the existing set. Then it’s already set up and you don’t need to do anything other than confirm the working PL2303 driver is installed (next section). with the correct hardware IDs listed under DenyDeviceIDs, and under Restrictions: If the key is present, you’re going to need to interpret what’s already there and decide what to do. If this key is not present, there’s no need to proceed any further. It most likely isn’t there, and you will only be able to go as far as HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DenyDeviceIDs Navigate as far as you can go to this key: Open regedit (WindowsKey-R, then enter regedit) To determine if there is an existing policy in place, do the following: If you simply merge the pl2303.reg file into the registry, you may overwrite an existing policy that has been set up by some other process, e.g. If they don’t, click them in the Value list with the right mouse button, select and copy and paste them into the pl2303.reg file in your text editor.Ģ Check for a Pre-existing Device Installation Restriction Policy The values should match the list in the reg file you’ve created. Go to the Details tab, and select the Hardware IDs property. Locate the Prolific USB to Serial Comm Port in Device Manager, right click it, and select Properties. Confirm the working PL2303 driver is installedĪre the hardware IDs (USB\VID_067B
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