While jailbreaking iOS 9.3.5 is now considered stable, it is not without risks. Users must be cautious of downloading tweaks from "pirate" repositories, which can contain malware. Furthermore, because the vulnerabilities used to jailbreak the device are the same ones used by malicious actors, a jailbroken device on such an old firmware is inherently less secure than a modern one. For enthusiasts, however, the trade-off for total digital freedom remains a price worth paying.
Restart your device to verify that Cydia still opens immediately. Why Jailbreak iOS 9.3.5 in 2024? ios 9.3.5 untethered jailbreak
Otherwise, use Phoenix/kok3shi9 and accept the 30-second re-jailbreak process after a reboot. While jailbreaking iOS 9