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How to Fix Logitech MX Master 4 Not Detected in Logi Options+

💻 Device: Logitech MX Master 4 🗓 Added

Causes

  • Logi Options+ system service failed to start or crashed on boot — the MX Master 4 requires the Logi Options+ background service (LogiMgr on macOS, LogiOptionsPlusService on Windows) to be running in order to enumerate the device. If the Windows service is set to Manual instead of Automatic, or if the macOS launch agent failed to load after an update, Options+ will show "No device detected" even though the mouse is connected and working for basic cursor movement
  • Corrupted Logi Options+ installation after an update — incremental updates to Logi Options+ can leave behind stale driver files or registry entries that prevent the MX Master 4 from registering with the application. This is especially common after a macOS major version upgrade (e.g., macOS 25 → 26) where the Logitech HID driver plugin (.plugin file) does not get properly migrated to the new OS version
  • macOS privacy permissions reset after system update — macOS resets Accessibility and Input Monitoring permissions for Logi Options+ after every major macOS update. Without these permissions, the Options+ daemon cannot communicate with the HID subsystem and cannot detect or configure the MX Master 4, even though basic HID functionality (cursor movement, left/right click) works because it uses the system's generic HID driver stack
  • Conflicting Logitech software installations — having both Logi Options+ and Logitech G-Hub installed simultaneously causes a driver stack conflict where both applications try to claim the MX Master 4's HID interface. The older Logitech Gaming Software (LGS) or Logitech Unifying Software can also interfere with the Bolt receiver's HID report descriptor, preventing Options+ from recognizing the mouse
  • Logi Bolt receiver paired with the wrong device profile — the Logi Bolt receiver can store pairing information for multiple Logitech devices. If the receiver was previously paired with a different Logitech mouse (e.g., MX Master 3S or MX Anywhere 3S) and the new MX Master 4 was not properly paired to that receiver, Options+ will see the receiver but not the mouse, resulting in a "Connect your device" prompt that never resolves
  • Firewall or security software blocking Logi Options+ local socket communication — Options+ uses local network sockets (127.0.0.1:port) for inter-process communication between its UI and system service. Aggressive firewall rules, VPN client split-tunneling configurations, or endpoint detection and response (EDR) software can block this local traffic, making the UI unable to detect that the service has found a connected device

How to Fix

  1. Verify the Logi Options+ service is running: on Windows, press Win + R, type services.msc, and press Enter. Scroll down to LogiOptionsPlusService — its Status should say "Running" and Startup Type should be "Automatic." If it is not running, right-click it and select Start. If the startup type is not Automatic, right-click → Properties → set Startup type to Automatic → Apply → Start. On macOS, open Terminal and run launchctl list | grep logi — you should see com.logitech.logioptionsplus in the output. If not, run launchctl load /Library/LaunchAgents/com.logitech.logioptionsplus.plist and restart the app
  2. Re-grant macOS permissions: go to System Settings → Privacy & Security → Accessibility → ensure Logi Options+ is listed and toggled ON. Then go to Input Monitoring → ensure Logi Options+ is toggled ON. If the app is not listed in either category, click the + button and manually add Logi Options+ from /Applications. After granting permissions, right-click the Logi Options+ icon in the menu bar → Quit, then relaunch the application from /Applications. The mouse should appear within 15 seconds
  3. Perform a clean reinstall of Logi Options+: on Windows, open Settings → Apps → Installed Apps → find Logi Options+ → Uninstall. After uninstalling, press Win + R, type %appdata%, and delete the LogiOptions folder if it exists. Also delete C:\ProgramData\LogiOptions if present. Restart your PC, then download the latest Logi Options+ installer from logitech.com/optionsplus and install fresh. On macOS, drag Logi Options+ from Applications to Trash, then delete ~/Library/Application Support/LogiOptions and ~/Library/Preferences/com.logitech.logioptionsplus.plist. Empty Trash, restart your Mac, and download/install the latest version
  4. Remove conflicting Logitech software: uninstall Logitech G-Hub (if installed) via Settings → Apps → Installed Apps → Logitech G-Hub → Uninstall. Also uninstall any instance of "Logitech Unifying Software" or "Logitech Options" (the older non-Plus version). After removing, restart your computer and open Logi Options+ — the MX Master 4 should now enumerate immediately. If you need G-Hub for gaming peripherals, install it in a separate Windows user account or use a portable version to avoid driver conflicts
  5. Re-pair the MX Master 4 with the Logi Bolt receiver: turn the mouse off and on using the power switch on the bottom. Press the Easy-Switch button to select channel 1 (the LED above it should blink rapidly). Insert the Logi Bolt receiver into your computer. Open Logi Options+ → click the + (Add Device) button → select Logi Bolt → follow the pairing prompts. If the mouse does not enter pairing mode automatically, press and hold the Easy-Switch button for 3 seconds until the LED starts blinking rapidly, then click "Pair" in Options+. After pairing, the mouse should appear in the device list
  6. Repair Logi Options+ installation on macOS without reinstalling: download the latest Logi Options+ installer from Logitech's website, then run the installer package again. It will detect the existing installation and offer a "Repair" option (look for the maintenance tool icon in the installer menu). Run Repair — this re-registers the HID plugin, re-installs the launch agent, and re-establishes the kernel extension linkage without losing your device settings. After the repair, restart your Mac
  7. Check firewall and VPN settings: temporarily disable any third-party firewall, antivirus, or VPN software (NordVPN, ExpressVPN, Bitdefender, etc.) and restart Logi Options+. If the mouse is detected with the security software disabled, add an exception for Logi Options+ in your firewall settings — allow incoming and outgoing TCP connections on localhost (127.0.0.1) and allow the application's system service to communicate through the firewall. For VPN clients, enable "split tunneling" and exclude Logi Options+ from the VPN tunnel
  8. If the mouse is still not detected after all steps, try the MX Master 4 on another computer: install Logi Options+ on a different PC or Mac and connect the mouse. If it appears on the second computer, the issue is specific to your original system's configuration (likely a HID driver conflict or OS-level permission issue). If the mouse does not appear on the second computer either, the Logi Bolt receiver may be faulty — contact Logitech Support to request a replacement Bolt receiver. The MX Master 4 is covered by a one-year limited hardware warranty that includes the receiver
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