This was the holy grail. It was the key to an untethered jailbreak for 32-bit devices (the iPhone 5, 5c, 4s, and iPad 4) running iOS 9.1 through 9.3.4.

Go to Settings > General > About to confirm you are exactly on iOS 9.3.5 (or iOS 9.3.6 for cellular models).

But the question remains for collectors, gamers, and tinkerers: Does a true untethered jailbreak exist for iOS 9.3.5?