We are aware that after upgrading from macOS 10.14 Mojave or earlier to macOS 10.15 Catalina with Logitech Control Center (LCC) versions 3.9.8 or earlier installed, some Logitech Unifying-based devices may stop working. This is a known issue on macOS 10.15 Catalina and we’re actively working with Apple to address it.

In the meantime, if your Unifying device no longer works after upgrading to macOS Catalina, please update to LCC 3.9.9 and reboot the system to complete the installation. You can download LCC 3.9.9 from the Logitech Control Center Download page.

If your device still doesn’t work, please check the version of Unifying drivers that are on your system. Do the following:

1. Launch Terminal from /Applications/Utilities folder,
2. Run the following command:
   kextstat | grep -i Logi 
3. You should something something similar to the following displayed: 
   105 1 0xffffff7f8252b000 0x47000 0x47000 com.Logitech.ControlCenter.HIDDriver (3.9.9) BB513FDB-C9C7-3A6F-AD71-58CDD322B095 <104 76 49 25 6 5 3>
   106 0 0xffffff7f82582000 0x16000 0x16000 com.Logitech.Unifying.HIDDriver (1.3.9) 4E15EC6B-3BB3-3644-B366-F5EFB857C2BB <105 104 49 25 6 5 3>

If the version displayed for com.Logitech.Unifying.HIDDriver is anything other than 1.3.9, then the new driver was not properly loaded by macOS Catalina. To fix this issue, please try the following steps:

1. Start your system in Recovery Mode:
   • Restart your computer. From the menu bar, click on the Apple logo and select Restart.
   • Hold the "Command" and "R" keys until the Apple logo appears.
2. You should see the "macOS Utilities" screen. If not, repeat step 1.

   

3. Close this window using the red button on the top left.
4. Click Choose Startup Disk…

   

5. Select Restart...

   

6. At the prompt asking “Are you sure you want to restart the computer?”, select Restart. You may see a spinning icon for a few minutes before the system reboots.