How To: Programming and Firmware for DIY Mechanical Keyboards

March 27, 2024

You've just completed the assembly of your personalized mechanical keyboard. The switches emit the right click, and the keys have the ideal weight. Still, it's not fully personalized until you've customized the firmware.

This means you need to program your custom mechanical keyboard. How? Isn't programming something a complex task for experts? Well, not at all. You can do it yourself.

Here's a detailed discussion on keyboard firmware and programming. We'll simplify the complicated aspects of QMK, keymap alterations, and even how to deal with errors. It's time to make your keyboard truly unique!

What Is Firmware

Do keyboards have firmware? Most high-quality mechanical keyboards have. Firmware refers to the software that controls the keyboard's behavior and functionality. Think of firmware as the "soul" of your keyboard. It's essentially the operating system of the keyboard, responsible for interpreting key presses, managing lighting effects, handling macros, and implementing any other customizable features the keyboard may offer.

Firmware can be updated or modified, typically through software provided by the keyboard manufacturer. Updates may include bug fixes, performance improvements, or the addition of new features. Advanced keyboard modders modify existing firmware or create their own to customize their keyboards even further, tweaking things like key mapping, debounce settings, and LED effects to suit their preferences.

Firmware can generally be categorized into two main types:

  1. Factory Firmware: This is the default firmware installed on the keyboard by the manufacturer. It includes all the standard features and functionality intended for the keyboard out of the box. Factory firmware is usually proprietary and closed-source, which means users cannot directly access or modify its code.
  2. Custom Firmware: Custom firmware is developed by third-party developers or the keyboard community itself. It's often open-source, allowing users to access, modify, and redistribute the code freely. Custom firmware can offer additional features, improvements, and customization options beyond what the factory firmware provides.

    Examples of custom firmware for mechanical keyboards include QMK (Quantum Mechanical Keyboard Firmware), TMK (The MeKeyBoBild), and EasyAVR.

How to Update Your Mechanical Keyboard's Firmware

an image of a mechanical keyboard

As part of their marketing, after-sales service, and technical development, mechanical keyboard manufacturers often provide firmware updates. These updates are necessary to fix bugs, upgrade compatibility, improve performance, add features, and more. 

To ensure that your keyboard is functioning optimally, you must update your device's firmware.

  1. Check for Updates: Visit the manufacturer's website (or online forums for custom firmware) to see any firmware updates available for your keyboard. Download the latest firmware version and any accompanying software or tools required for the update.
  2. Backup Custom Configurations: If you have customized key mappings, macros, or other settings on your keyboard, it's highly recommended that you back them up before updating the firmware. This ensures that you can restore your configurations after the update.
  3. Prepare for Firmware Update: Make sure your keyboard is connected to your computer via a USB cable. Make sure it's in bootloader mode or update mode as specified by the manufacturer. This often involves holding down certain keys or using a dedicated button combination while plugging in the keyboard.
  4. Run Firmware Update Software: Open the firmware update software provided by the manufacturer or the community (if using custom firmware). Follow the on-screen instructions to initiate the firmware update process. 
  5. Wait for Update to Complete: The firmware update process may take several minutes. During this time, avoid unplugging the keyboard or interrupting the update process. Doing so could potentially damage the keyboard or corrupt the firmware.
  6. Verify Update: Once the firmware update is finished, verify that the update was successful by checking the firmware version displayed in the update software or by testing the keyboard's functionality.
  7. Restore Custom Configurations: If you backed up your custom configurations earlier, restore them to the keyboard using the appropriate software or tools provided by the manufacturer or the community.
  8. Test Keyboard Functionality: After updating the firmware and restoring your custom configurations, test your keyboard. All keys should be working correctly. Test any custom features or macros you've configured.
  9. Troubleshooting: If you encounter any issues or unexpected behavior after the firmware update, consult the manufacturer's documentation, community forums, or support resources for troubleshooting assistance.

Why You Should Program Your Keyboard

Programming your mechanical keyboard offers several benefits:

  1. Customization: Programming your keyboard enables you to customize key mappings, macros, and functions to suit your needs and preferences. You can remap keys to match your preferred layout, assign macros to streamline repetitive tasks, and create custom shortcuts for frequently used applications or functions.
  2. Efficiency: By optimizing your keyboard layout and assigning macros to commonly used actions, you can increase your typing speed and productivity. Custom key mappings and shortcuts can reduce the need to reach for the mouse or navigate through menus.
  3. Personalization: Programming your keyboard allows you to personalize its behavior and appearance to reflect your style and workflow. You can customize RGB lighting effects, create unique key combinations, and fine-tune settings to match your preferences.
  4. Accessibility: For users with specific accessibility needs or ergonomic requirements, programming your keyboard can provide tailored solutions to improve comfort and usability. 
  5. Future-Proofing: Programming your keyboard gives you greater control over its functionality and allows you to adapt to changes or updates in hardware or software. If you encounter compatibility issues or want to add new features in the future, having a programmable keyboard gives you the flexibility to make adjustments as needed.

How To Program Your Keyboard

an image of a mechanical keyboard

Programmable keyboards are meant to be programmed! They're meant for you to customize to your preferences and tastes! So take advantage of this programmability. Here's a general guide on how to program your keyboard. Specific steps for programming your device can be found in the instruction manual, on the manufacturer's website, or in online forums if you're using customizable software. 

  1. Choose Your Firmware: If your keyboard supports customizable firmware, decide which firmware to use. Visit the firmware's website or community forums to learn more about its features, compatibility, and installation process.
  2. Install Required Software: Depending on your chosen firmware, you may need to download and install specific software tools for programming your keyboard. For example, QMK provides a command-line interface (CLI) tool called QMK Toolbox for flashing firmware to compatible keyboards.
  3. Configure Your Keymap: After installing the software, you can start configuring your keyboard's keymap. This involves defining the layout of your keyboard and assigning functions or actions to each key. Use graphical tools provided by the firmware, text-based configuration files, or online keymap editors to create your keymap.
  4. Compile Firmware: Compile the firmware to generate a binary file that can be flashed to your keyboard. This converts your keymap configuration into a format that the keyboard can understand. If you're using QMK, you can use the QMK Toolbox or command-line tools to compile the firmware.
  5. Enter Bootloader Mode: Before flashing the firmware to your keyboard, you'll typically need to put the keyboard into bootloader mode. This allows the firmware to be updated or replaced. The method for entering bootloader mode varies depending on the keyboard model and firmware. 
  6. Flash Firmware: Once your keyboard is in bootloader mode, you can use the firmware flashing tool provided by the firmware to flash the compiled firmware binary to the keyboard. This transfers the new firmware to the keyboard's microcontroller, updating its behavior and functionality based on your keymap configuration.
  7. Test Functionality: Test your keyboard. Check if the keys are mapped correctly, macros work as intended, and any custom features or settings are functioning properly.
  8. Refine and Iterate: Programming your keyboard is an iterative process. You may need to refine your keymap configuration based on your usage and feedback. Experiment with different layouts, shortcuts, and settings to find the optimal setup for your needs.


Firmware updates and keyboard programming can really give your keyboard its own life and personality. These will unleash your keyboard's true potential. These will make your gaming and typing experience truly amazing! And the best thing? Updating your firmware and programming your keyboard is just a few clicks away. 

Chris Greiner, a Mechanical Keyboard specialist, boasts a solid educational background with dual bachelor's degrees in Computer Science and Business Management from Lewis University. His additional certification in Mechanical Keyboard Design showcases his dedication to staying on the forefront of keyboard technology. Chris primarily writes for keyboard enthusiasts and has been featured on platforms like Jestik, solidifying his reputation as a thought leader in the mechanical keyboard community.
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