If you have an OnePlus device, I'm pretty sure you have this app pre-installed. To check open Settings -> Apps -> Menu -> Show system apps and search EngineerMode in the app list to check
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Cool thanks. You really replying to everyone! What a day for you!

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Yes, today is a crazy day for me
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Hey do you respond to DM I have a question regarding this root method that you've discovered
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I try to do my best!
End of conversation
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