Phoenix is a designed exclusively for 32-bit iOS devices running iOS 9.3.5 and 9.3.6 . It was released by the prominent hacker group Siguza and tihmstar (known for other tools like "EtasonJB" and "Home Depot").
The exploit may take multiple tries to succeed. If the app crashes or the device reboots without installing Cydia, simply try again. Phoenix Jailbreak Download Ios