Quick answer: You can't.

Long answer: Because you're not on a firmware revision that is currently exploited, you cannot run any homebrew on it. Downgraders, cheat devices, and custom firmwares are all forms of homebrew.
Therefore, 3.11 is incapable of doing anything other than what Sony let you do. (Ie, official features only; no cheat devices).

Also, the firmware isn't likely to be exploited any time soon. The security is so damned tight nowadays that we may never break it. Though, if 3.11 ever does get exploited, come back and we'll be more than happy to help!

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