Please factory reset your Q3 to the latest firmware (How to Factory Reset or Use the Launcher Web App to Flash Firmware for Your Keyboard).
Note: Please download the right Q3 firmware which matches your keyboard model.
If VIA can't pair with your Keychron Q3 after you tried flashing, you need to follow these steps:
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Reconnect your keyboard power cable.
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If VIA still doesn’t pair together after you reconnect the power cable, download the Keychron Q3 keymap JSON file which can be found here.
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Open the VIA and turn on "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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VIA should pair together with the Keychron Q3 now.
If the problem persists, please shoot a video when you try the above steps and contact us at support@keychron.com with the video attached. We will have our tech team check the problem and find proper solutions for you.