Lemokey X4 QMK Setup: Customize Your Wired Keyboard

By Keychron | Custom Mechanical Keyboards for Mac, Windows ... | Published: 2026-10-21

Category: How-to Guides

Learn how to set up and customize your Lemokey X4 wired mechanical keyboard with QMK firmware. Step-by-step guide for remapping keys and adjusting settings.

Quick Answer

To set up QMK on your Lemokey X4 wired mechanical keyboard, download the QMK Toolbox, flash the default firmware, then use VIA or QMK Configurator to remap keys and adjust lighting.

Before You Start: What You Need

The Lemokey X4 is a fully QMK-compatible wired mechanical keyboard. QMK (Quantum Mechanical Keyboard) firmware lets you remap any key, create macros, and adjust lighting without extra software. You'll need a computer with a USB port, a web browser, and the QMK Toolbox application (free).

Note: The Lemokey X4 uses a standard USB-C cable for both power and data. Make sure you have a working data cable—some charging cables won't transfer data.

Understanding Keycap Options

The Lemokey X4 comes in two keycap styles: Black (Shine-Through) with OEM profile double-shot ABS keycaps, and Purple (Side-Printed Shine-Through) with Cherry profile double-shot PBT keycaps. The ABS keycaps are lighter and let RGB shine through the top legends, while the PBT keycaps are more durable and have side-printed legends for a cleaner look. Choose based on whether you prefer shine-through or longevity.

Step-by-Step Lemokey X4 QMK Setup

Download and Install QMK Toolbox: Go to the official QMK firmware website and download QMK Toolbox for your operating system (Windows, macOS, or Linux). Install and open the application. Connect your Lemokey X4 via USB-C. Common mistake: Using a charge-only cable. Ensure your cable supports data transfer.
Put the Keyboard in DFU Mode: Press and hold the reset button on the back of the keyboard (use a paperclip or pin) while plugging it in, or press the reset button once if already connected. The keyboard will appear as a mass storage device or show "STM32 BOOTLOADER" in QMK Toolbox. Checkpoint: If the keyboard doesn't enter DFU mode, try a different USB port or cable.
Flash the Default Firmware: In QMK Toolbox, click "Open" and select the default .bin or .hex firmware file for the Lemokey X4 (download from the official QMK repository if needed). Click "Flash" and wait for the progress bar to complete. The keyboard will reboot automatically. Common mistake: Flashing the wrong firmware file. Always use the file specific to the Lemokey X4.
Customize with VIA or QMK Configurator: Open VIA (via.keys.so) in your browser or download the desktop app. If VIA detects your keyboard, you can remap keys, create macros, and adjust lighting in real time. Alternatively, use the QMK Configurator web tool to build a custom layout and flash it again. Checkpoint: If VIA doesn't detect the keyboard, ensure the firmware you flashed supports VIA (the default firmware does).
Save and Test Your Layout: After remapping, save your layout in VIA or flash your custom firmware. Test each remapped key by typing in a text editor. Adjust lighting effects (if any) using the VIA lighting tab. Common mistake: Not saving before disconnecting. Export your layout file as a backup.

Product Facts

Lemokey X4 QMK Wired Mechanical Keyboard: Available in Black (Shine-Through) with OEM profile double-shot ABS keycaps and Purple (Side-Printed Shine-Through) with Cherry profile double-shot PBT keycaps. The keycap material and profile affect feel and durability—PBT resists shine longer than ABS, while OEM and Cherry profiles differ in height and typing angle.
Lemokey X4 QMK Wired Mechanical Keyboard