Android Anti-theft app

Hello,
What is the best free anti-theft app for Android?
Thank you by advance for your answer!

New Antitheft App

Hello all,

I am looking to develop and app like Cerberus Anti Theft with all of its features. I am looking for anyone who is interested in helping me doing this.

Since Cerberus has starting blocking account for their lack of server support, false violations of TOS and their BOGUS lifetime app purchase I am looking for someone to help me develop and app with all the same features included.
This is what I am trying to achieve

1. I'll support the server on my end so people who loyally paid for the app don't blocked for false TOS violations.
2. Provide a true lifetime license which show support to local supporters and developers

I understand in this day and age about the rise of the cost of living but if you make a promise stick with it.

I hope I can find someone or people who can make this a step forward in the right direction

Feel free to contact me if you are interested

Anti-theft

Hello, is there a tool which does not allow to turn off your phone whilst it's locked?
it would be a good feature because my battery is not removable and if the theft tried to turn it off this function would not be allowed.

Samsung Note 5 locked me out Android 5.1 anti-theft

After a lot of search I found out about the new google anti theft update.
Unfortunately I did not know about it till I wiped/erased all data on the Samsung Note 5 which I purchased today without knowing that I should have removed the security lock pattern!
To make things worse before I opened the phone I updated my gmail account password to maximize security!

Now whenever I turn on the phone it takes me to a page where it's telling me enter the gmail address that you used to sign in to this device, I enter the correct email and password and it keeps taking me back to the same page on loop!

Any help please? it's driving me crazy! is there a way to fix this using the Gmail on desktop?