By the time iOS 9.3.5 was released, untethered jailbreaks were becoming rarities. Apple’s introduction of KPP (Kernel Patch Protection), mandatory code signing, and the gradual hardening of the boot process made persistent, reboot-proof code execution extraordinarily difficult. The Phœnix jailbreak for 9.3.5 was one of the last publicly available untethered jailbreaks for a modern (64-bit) iOS version.
: Using iOS 9.3.5 in 2026 means you are missing years of critical security patches. Jailbreaking further opens the filesystem, so it is recommended to only use these devices for offline media or specific legacy tasks. ios 9.3.5 untethered jailbreak