OnePlus inadvertently left a backdoor on its phones
 

OnePlus' security troubles aren't over yet. Users have discovered that many of the company's phones from the past few years (including the OnePlus 5) include a Qualcomm testing app, EngineerMode, that lets you get root-level access to the phone with...

https://www.engadget.com/2017/11/14/...oor-on-phones/