How to flash the firmware and factory reset the Keychron M3 4K mouse

(1) If everything is working with your mouse, please don’t flash the firmware. There is a chance it can damage your mouse.
(2) This guide is for Keychron M3 4K users only. Please flash the firmware on your Windows PC. (We are working on making it accessible for Mac systems.)
(3) If you have multiple Keychron mice, please flash each one by one. Do not plug all the mice into the computer at the same time.

The firmware update includes two parts:
(1) Flash the firmware for the 4K wireless receiver;
(2) Flash the firmware for the M3 4K mouse.

Please follow the instructions below.

Flash the firmware for the 4K Wireless Receiver

Step 1: Connect the 4K wireless receiver to your Windows PC.

Step 2: Download the firmware update app below. Before opening it, please make sure your M3 4K mouse is NOT in wired mode.

Download M3 4K Mouse Firmware Update App

Step 3: Open this app and start your receiver firmware update.


Now you have updated the receiver firmware successfully. Please follow the instructions to flash the mouse firmware.

Factory reset the M3 4K mouse

After the receiver and mouse have finished the firmware update, please factory reset the M3 4K mouse.

Note: After factory resetting, you need to reconnect the mouse to your device via the receiver or re-pair via Bluetooth.

*Refer to the following instructions to learn how to connect the M3 4K mouse to your device in 2.4GHz/Bluetooth mode.