Keychron K4 Pro Wireless Mechanical Keyboard User Guide
- June 9, 2024
- Keychron
Table of Contents
Keychron K4 Pro Wireless Mechanical Keyboard
Connect Bluetooth
Press fn + 1 (for 4 seconds) and pair with device named Keychron K4 Pro. Switch toggle to Bluetooth
Connect Cable
Switch toggle to Cable
The VIA Key Remapping Software
Please visit caniusevia.com to download the latest VIA
software to remap the keys. If the VIA software cannot recognize your
keyboard, please reach out to our support to get the instruction. (VIA only
works when the keyboard is connected by wire to the computer.)
The Layers
There are four layers of key settings on the keyboard. The layer O and layer 1
are for the Mac system. The layer 2 and layer 3 are for the Windows system. If
your system toggle is switched to Mac, then the layer O will be activated. If
your system toggle is switched to Windows, then the layer 2 will be activated.
Remember that if you are using it in Windows mode, please make changes to the
layer 2 instead of the top layer (the layer 0). This is a common mistake
people are making. The Backlight 
Adjust The Backlight
Brightness
Adjust The Backlight Speed 
Warranty
The keyboard is highly customizable and easy to be rebuilt. If anything goes wrong with any of the keyboard components of keyboard during the warranty period, we will only replace the defective parts of the keyboard, not the whole keyboard.
Watch The Building Tutorial On Our Website
If you are building the keyboard for the first time, we highly recommend you
watch the building tutorial video on our website first, then start building
the keyboard yourself.
Factory Reset 
Troubleshooting? Don’t know what’s going on with
the keyboard?
- Plug in the power cable and switch the keyboard to Cable mode.
- Factory reset the keyboard by pressing fn + J + Z (for 4 seconds).
- Download the right firmware and QMK Toolbox from our website.
- Switch the keyboard to OFF mode and remove the space bar keycap to find the reset button on the PCB.
- Hold the reset key first, then switch the keyboard to Cable mode. Release the reset key, and the keyboard will now enter DFU mode.
- Flash the firmware with the QMK Toolbox.
- Factory reset the keyboard again by pressing fn + J + Z (for 4 seconds).
- Step by step guide can be found on our website.