Please factory reset your Q2 to the latest firmware (How to Factory Reset or Flash Firmware for Your Keychron Q2 keyboard?).
Note: Please download the right Q2 firmware which matches your keyboard model.
If VIA can't pair with your Keychron Q2 after you tried flashing, you need to follow these steps:
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Unplug your keyboard from your computer.
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Please download the correct keymap JSON file that can be found on our Q2 product page.
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Open the VIA, and turn on the "Show Design tab" in the "Settings" tab.
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Drag the JSON file into the “Design” tab on the VIA.
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Replug your keyboard.
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VIA should pair together with the Keychron Q2 now.
If the problem persists, please contact us at support@keychron.com with a recorded video of you trying the steps above. We will have our tech team check out the problem and find a proper solution for you.