If your Razer Chroma RGB Mobile App is crashing after the latest update, clear app user data to resolve this issue.
Note: Steps on how to clear App Data vary depending on your phone.
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Press and hold the Razer Chroma RGB Mobile App.
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Tap the App info icon.

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Select "Storage".

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Tap "Clear Data".

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Tap "OK".
Note: All of this app's data will be deleted permanently.

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If the issue persist, uninstall and reinstall the Razer Chroma RGB Mobile App.