I was curios and installed app 'Engineer mode test tool' app listed me 'codes' and for most of them wasn't written what they do, so I couldn't resist stupidity and entered few of them, after one phone rebooted and android icon was showed and saying earsing, I've got mini heart attack because I tought i was reseted phone, but that wasn't the thing. White screen showed up saying something like this "enter password to unlock device" and keyboard showed up with all the letters and numbers. And it said how I have 30 attempts and I entered every password that I could remember and nothing worked and counter said that I used just one guess no matter how many password I enter. In the end I factory reseted phone because I need it, and the most ironic thing is that my data was on sd card but it was adopted so I lost all data.
Oh, yeah, that code was listed under google service framework in the app mentioned above. My question what have I done entering that code, what was that screen that I got?