This is an unbrick service by the people from Ragebot. Your credentials are only used once, we do not store them.
Alternatively, we made an Android app for unbricking accounts, it can be downloaded at https://ragebot.net/public/unbrik.apk. By using this, your credentials won't be shared with us. It's recommended to run it a couple of times until no bad messages are found anymore.
For your own sake, only download the unbrick app from the Ragebot.net website.
This is an early release, if you experience any bugs then please let us know at @lemagedurage or @NyxieDK