This is a feature Apple added to High Sierra which affects all kernel extensions, not just Silicon Labs. I tried to install and uninstall the driver several times on Mac Os High Sierra. Post as a guest Name. There are a couple of useful commands. Community Interface Knowledge Base. Hope that’s helpful and thank you for looking into my issue.

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Interface Forum

It applies to any third party kernel extension. Replied 11 days ago.

Kexts won’t unload if they are in use. A good tool to macinotsh with before anything else is CoolTerm easy to find However, this type of kernel extension is loaded and unloaded dynamically by the operating system when devices are plugged and unplugged that need the driver.

So when you run the installer as I described above it basically just puts that file on your computer and tries to load it.


This was the only solution that worked for me. I’m using the official driver downloaded from https: The Silicon Labs CPx kernel extension will be listed as “com. Replied Aug 266: Installing the Driver After installing complete, I have not been prompted by the Mac security settings.

It is documented in a technical note called TN which I’ve linked to here. Replied 19 days ago. Dominik Palo 7.

3. Mac OS X Drivers

Here are steps to allow this extension: Its not a “bug”. Want to add to the discussion? For High Sierra The vendor ID is 0x1a86 or By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Silicon Labs Location ID: If the driver was blocked, it is supposed to have a button that should say “approve” on it. I installed a second time as was suggested in one thread.

CPX USB to UART Bridge VCP Driver Not Loading (Mac OS X Sierra)

Community Interface Knowledge Base. Home Questions Tags Users Unanswered. So make sure you check that. How can you tell?


Install CPx USB to UART Bridge VCP Driver on Mac OSX – Mac App Store

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. There is no port enabled. Thomas, you may have a previous version of the driver installed. I have attached a couple of sceen shots. So check that too. I madintosh see these values showing up for any of the supported personalities for our driver.

That contains a list of dictionaries.

Replied 52 days ago. Open Terminal and type ‘kextstat’. Replied Sep 025: