Lighting flickering or stuttering on your Razer keyboard is commonly caused by connection, firmware, or software issues.
You can view the video below for instructions or review a copy of the video transcript.
Below are the steps to resolve the issue.
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Connect your keyboard directly to your PC’s USB port.
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Check for firmware updates.
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Visit Software and Firmware Updates for Razer Peripherals to see if a firmware update is available for your device.
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Download the firmware.
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Follow the on-screen installation instructions.
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Exit Razer Chroma App.
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Go to the system tray on your taskbar.
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Right-click on the Razer icon and select “Exit Chroma”.

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If exiting Razer Chroma App solves the issue, perform a clean re-install of the app. See How to re-install Razer Chroma App for instructions.