Yeah… I own OnePlus 5T smartphone (by Oppo Electronics) at last. OnePlus is famous with their clean and fast operating system. Yup, stock Android + few modification here and there. That’s it. So here is the guide to test all the hardware functions like LCD, camera, Wi-Fi, microphone, sensor when you got OnePlus smartphones / going to buy it at shop. In short, just bring up FactoryMode app to test. Should work on other OnePlus models like OnePlus One, 2, X, 3, 3T, 5 and my current 5T. Upcoming 6 and 6T should work too…
That’s it. Be sure to test most of the functions especially LCD screen for dead pixel. Enjoy your new OnePlus Smartphone…
You say “make sure to test all the features..” but it’s it safe?
Yes, it’s the app from OnePlus itself.