Due to the 4s being 32-bit, several exploits work that do not work on newer iPhones.

The most reliable tool for an iPhone 4s on iOS 9.3.5 is (created by the r/Jailbreak community). It leverages the Sigpatches exploit specific to 32-bit devices.

The Ghost in the Machine: The Ethics, Mechanics, and Legacy of the iOS 9.3.5 Activation Lock Bypass

: If you can contact the previous owner, they can remove the device remotely. They must sign in to iCloud.com/find , select the iPhone 4s, and click Remove from Account .

, which is cheaper and often considered more stable for this specific hardware exploit. iOS 6.1.3 Downgrade Strategy: