Assume that I have turned on Android Device manager to locate my phone in case of theft, and I also installed some security apps which can send message when someone tries to change the SIM card.
Now suppose I lost my phone. The one who finds it is tech savvy. Firstly, (s)he does a factory reset after booting into Recovery mode, followed by flashing a new custom ROM, and then (s)he starts using my phone.
Will Android Device Manager still work?