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Rooted but I didn't do it, how to unroot? Jan 7, 2022

JosephLP , Jan 7, 2022 :

In early September I had an assignment in a class for which a qr scanner was helpful. The qr scanner on my phone that is part of my camera was not working. So I downloaded one from the Google play store.

The name of the app is QR code reader - Scanner app from Marks Duan. Later that day a few of the apps I use on my phone told me that my phone was rooted. I thought impossible I’m very careful with keeping my phone from vulnerabilities. My mind quickly went to the app I had downloaded. However, at the time I thought “rooted” was related to some sort of malware, not “jailbreaking”. Which of course made no sense. I never did anything to jailbreak my phone. I deleted the app, no difference. Rebooted, no difference. I even did a factory reset, no difference. My phone has gotten at least two major system updates. No help.
Only other thing that had happened was when I had done a system update to oxygen the night before the class. It just doesn't make any sense for the operating system itself to cause an accidental rooting.

Emailed One plus early October but I was not able to coordinate with them in a timely manner because I was busy with school. After I finished school last month, I contacted One plus to reopen my case. They indicated I should post on the forum.