While a "True Untethered" solution (one that survives reboots automatically without user interaction) is technically feasible for iOS 9.3.6 via kernel patching, the safer and currently maintained standard is the approach. This method leverages the "Home Depot" exploit chain to provide temporary kernel patching capabilities upon user demand.
: This tool provides a fully untethered jailbreak for all 32-bit devices running iOS 8.0–9.3.6. It uses iocaste for the untether on versions 9.3.5 and 9.3.6. ios 9.3 6 jailbreak untethered
However, you can achieve a fully state on 32-bit devices (like the iPhone 4s or iPad 2) by first installing a semi-untethered jailbreak and then applying an "untether" package. Recommended Path to Untethered Jailbreak To get an untethered setup, follow these general steps: Initial Jailbreak (Semi-Untethered) : Use Phœnix or kok3shi9 to jailbreak your device first. While a "True Untethered" solution (one that survives
: This is the standard choice for 32-bit devices (e.g., iPhone 4s, iPad 2, iPad 3, iPad Mini 1) on iOS 9.3.5 or 9.3.6. It is semi-untethered, meaning you must re-jailbreak using the Phœnix app on the device every time you restart. Why Use a Jailbreak on iOS 9? It uses iocaste for the untether on versions 9
Why? Because the iPhone 4s on 9.3.6 is incredibly unstable. If you had an untethered jailbreak, and a bad tweak caused a bootloop, your device would be permanently bricked (restore to 9.3.6 is no longer signed by Apple). With a semi-untethered jailbreak, you can simply reboot the phone, delete the bad tweak from safe mode (via Volume Up button), and re-jailbreak.