Logitech MX Master Frequently Asked Questions Manual page 12

1. Reduce the distance between the device and the Bluetooth receiver. If it's an internal Bluetooth
card (ex. laptop) then try improving the line of sight of the device to the computer.
2. Check for radio frequency (RF) interference from other sources, such as wireless speakers, cell
phone, and so on.
3. Check if the device works with the USB receiver. If it doesn't, then most likely the device is
defective.
Windows:

Try updating your Bluetooth chipset driver.

Check for Windows updates.

For a Bluetooth USB dongle, update the drivers for it from the manufacturer's website.

For an internal Bluetooth chipset, refer to the computer's motherboard manufacturer drivers.
Mac:

Check for OS updates.
 +Scroll wheel stuck or does not respond
Likely Cause(s):

Potential hardware issue

Operating system /software settings

After installing and/or updating Logitech Options on Mac OS 10.14 (Mojave) or higher Mac OS
requires user permission to be set. Please follow these steps.
Symptom(s):

Scroll wheel button moves but it doesn't scroll on the page

Ratched mode doesn't work

Free spin doesn't work
Possible solutions:
NOTE: If you have Mac OS 10.14 (Mojave) or higher and the scroll wheel stopped working since
installing and/or updating Logitech Options update, please set the user permissions following
these steps.
1. Clean the scroll wheel with compressed air.
2. Make sure the wheel itself moves and isn't physically stuck.
3. Check if the settings in Logitech Options for the scroll wheel are correctly selected. See
scroll wheel mode setting on MX Master
4. Disable Smooth Scrolling
mouse.
in Logitech Options.
Fixed