Firmware for Keychron K4

How to update the firmware?

WARNING: ONLY FOR Keychron K4 USERS 

Please follow the instructions correctly to flash the firmware.

  1. Download the correct firmware for your layout (K4 Gateron White Backlight/ K4 Gateron RGB Backlight / K4 Optical White Backlight / K4 Optical RGB Backlight ) otherwise, it can brick your keyboard. If you have installed the Gateron version's firmware to the Optical version, or install the Optical version's firmware to the Gateron version, the best way to undo it is to download the right firmware and flash it back.
  2. Make you have switched the keyboard to cable mode. If you flash the keyboard in the bluetooth mode, it will brick your keyboard.
  3. Make sure you have switched the system toggle correctly. ( Means you need to switch the keyboard to Windows if you are using a Windows, you need to switch the keyboard to the Mac if you are using a Mac
  4. Make sure that your keyboard is connected to the PC/Mac through the cable that comes with the box ( if you are using a third party cable, please make sure the cable can pass data as some of the cable can only be used for charging).
  5. Make sure that you use only Keychron keyboard to connect with the PC, otherwise, it might flash the firmware of your other keyboards. If you have multiple Keychron keyboards, please flash the firmware one by one, do not plug all the keyboards to the computer all together.
  6. Now start running the exe file for Windows or the app file for the Mac. On Mac if you meet the problem of “App is damaged and can’t be opened. You should move it to the Trash. ”  Please follow the instructions under this page to fix it. 
  7. After flashing the new firmware, hold "Fn"+"Z"+"J" these three keys together for five seconds to do the factory reset. Then you are good to go.

    What's new in this firmware

    1. fn + Caps Lock + P -- Hold these three keys together for 6 seconds, the Caps Lock key will no longer follow the backlight mode, it will be used to indicate the status of capital/ small letters. This feature was included in the last firmware, but with bugs, this time we have fixed the bug for this feature.
    2. fn + L + light effect key (the light bulb key) -- Hold these three keys together for 6 seconds, it will lock the light effect you are using now. To unlock the light effect, press these three keys together for 6 seconds again. Please make sure to hold the fn and L key first then hold the light effect key.
    3. Under the no backlight circumstances, if you press the light effect key, the backlight will be turned on. (We add this because there are too many users send questions to us saying "my backlight is not working." "my keyboard's backlight has dead '', but the reason for it is they accidentally turned off the backlight and forgot to turn it back.
    4. fn + I + D -- By default,  short press del to get del, press fn + del to get insert;   Hold these three keys together for 6 seconds, the function of the del key will be reversed to insert. Then the short press the key to get insert, press fn key combination will get the del function. Hold these three keys together for 6 seconds again to change back to the default.
    5. fn + p + pageup -- By default, short press pageup to get pageup; Hold these three keys together for 6 seconds, the function of the pageup key will be reversed to screenshot/print screen ( Mac: screenshot; Windows: print screen ). Hold these three keys together for 6 seconds again to change back to the default.
    Download the Firmware from the following link:
    Gateron Version:
    K4 Gateron White Backlight V1.1
    K4 Gateron RGB Backlight V1.1
    Optical Version:
    K4 Optical White Backlight V1.1
    K4 Optical RGB Backlight V1.1

    If you meet the problem of “App is damaged and can’t be opened. You should move it to the Trash. ”  Here is the instruction below to fix it. 

    1.Download the GateKeeper_Helper.(you can refer to this link and download it.) Completed download and open it. Then open the “GateKeeper_Helper”.

    2. You will see five options and ask you enter your choice, now you type 3 and enter, it will show you that “Drag & Drop The App Here Then Hit Return: “, please drop the firmware to the GateKeeper and hit Return and then input your password and click enter, now you will see the [Process completed], done!

    Finally, please try to open our firmware again and you should be able to process the firmware update now, thank you.

     

     

    Below are the old firmwares from the past

     

       The below firmware is factory default for Windows only

      Download the Firmware V4.0 from the following link:

      The firmware for Mac will be available soon.