Instashell is an Shell Script to perform brute force attack against Instagram, this script can bypass login limiting on wrong passwords, so basically it can test infinite number of passwords.
git clone https://github.com/thelinuxchoice/instashell
cd instashell
chmod +x instashell.sh
sudo ./instashell.sh
Script uses an Android ApkSignature to perform authentication in addition using TOR to change the ip address once blocked for many tries and continue attack.