How to prevent phone to install bloatware automatically I have a THL T9 Plus. I just wonder, why are applications installed automatically in background. I already installed NoRoot Firewall and Avira Antivirus. These are in most cases "HotKnotBean" and "Coordinator" named applications. I get notification by Avira, when these are installed and I can remove these too, but unable to protect phone from installation of these.
Looks like malware in your phone is pre-installed by manufacturer. 

It's better to install another ROM.
You may check here which one owners of your device recommend.