Undetectable helps you to generate fully undetectable payload of metasploit which can bypass android inbuilt antivirus.
$ sudo apt install apktool zipalign apksigner -y
$ git clone https://github.com/kinghacker0/Undetectable
$ cd Undetectable
$ bash undetectable.sh
Now select your options.
$ apt install apksigner -y
$ bash Termux-install.sh
$ bash Termux-UD.sh
You can read guide article on your website and watch youtube video from the link given below