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How to Factory Reset and Flash Firmware for Your Keychron S1 keyboard?

Troubleshooting? Or don't know what's going on with the keyboard? You may try factory reset. Note: If everything works fine with your keyboard. Please don’t flash the firmware. There is a chance it can damage your keyboard.

Factory Reset: Press fn + J + Z for 4 seconds until all the backlight flashes.

Flash Firmware

1. Download the S1 firmware below.

*firmware version 1.04 updated on August 10, 2023

*firmware version 1.5 updated on February 9, 2023

2. Download the QMK Toolbox (If the download link below does not work, use this link:

3. Unplug the power cable from the keyboard.

4. Open the QMK Toolbox.

5. Remove the space bar keycap to find the reset button on the left side of the space bar switch on the PCB.

6. Press down and hold the reset button.

7. Plug in the power cable. The keyboard will enter into DFU mode. Then, the QMK Toolbox will display in yellow words "***DFU device connected".

8. Click "Open" on the top right and choose the S1 firmware. Then, click "Flash" to start flashing the firmware (Note: Do NOT unplug the power cable while flashing).

9. Wait a few seconds until you see the content below, it means the keyboard has flashed successfully. 

10. Factory reset the keyboard again by press fn + J + Z for 4 seconds until all the backlight flashes.

If VIA can't pair with your S1 after flashed the firmware, you may follow these steps:

1. Reconnect the power cable with your keyboard.

2. Download the Keychron S1 keymap JSON file if you haven't.

3. Once you downloaded the keymap JSON file, please go to the VIA, and turn on "Show Design tab" in the "Settings" tab.

4. Drag the JSON file into the “Design” tab on the VIA.

6. You should see the keyboard's keymap on the Configure tab now.

Click here to see all tutorial for the S1.

You may contact if a defect covered by the warranty arises in your product within the warranty period. Keychron will honor the warranty of our S series keyboard (e.g.: S1 etc.) by one of the following methods at our discretion:

- Defects of S series keyboards have been caused by manufacturing: We will only replace the defective parts of the keyboard, not the whole keyboard, as its highly customizable and easy to be rebuilt.

- Defects of  S series keyboards have been caused by disassembling our product, improper installation, non-factory repairs/modifications, improper adjustment of the product, or neglect, including but not limited to “burn-in”, and similar wrongful use: We will NOT offer free service. We only offer paid service to replace the defective parts at your own cost (including the cost of parts, shipping fee and tax if applicable).