There is massive confusion in the online forums between an (which requires proof of purchase sent to Apple) and an iCloud bypass (which exploits a software flaw to hide the lock screen).
Have you successfully bypassed an iPhone 4s? Let us know which method worked for you in the comments below. Iphone 4s Ios 9.3.6 Icloud Bypass
That depends on your goal:
Here’s an idea for a tool or guide related to iPhone 4s on iOS 9.3.6 and iCloud bypass : There is massive confusion in the online forums
However, as a piece of history and a fun weekend hacking project, bypassing the iCloud lock on iOS 9.3.6 is deeply satisfying. You are taking a device that Apple declared "obsolete" and giving it a second life, circumventing a lock that was designed to protect a device nobody even manufactures anymore. That depends on your goal: Here’s an idea