A security researcher claimed to have rooted the super secure Smartphone Blackphone in just five minutes. The Blackphone is based on a customized version of Android dubbed PrivatOS. Blackphone was criticized by some security experts which consider the mobile phone only a container of privacy tools, that anyway runs on Android OS. The researcher didnt know to have tested a phone with old firmware and that the designers of Blackphone had already patched one of the vulnerabilities and pushed out the update. The security researcher took 5 minutes to root the device without unlocking the device bootloader.”]
Source: https://securityaffairs.co/wordpress/27511/hacking/blackphone-really-easy-root-probably.html