About nine months ago, Rootjunky managed to bypass the factory reset protection (FRP) on Samsung devices simply by inserting an OTG drive into the phone and installing an app. Then, two months later, he found a vulnerability on LG phones; this time, he circumvented FRP by using talkback settings to open a browser, downloading an APK that opened settings, adding a new user, switching back to the main account, and then resetting without FRP. However, this new exploit for Samsung phones might be the most ingenious yet.
Factory reset protection was added to Android with 5.1 Lollipop, but since different OEMs use different variations of Android, vulnerabilities can arise.
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