Can't enable full scene anti-aliasing on pipo s1 tablet with jellybean 4.1.1

Hello, my tablet is a pipo s1 running on 4.1.1 jellybean rooted. In developer option there's a full scene anti-aliasing option but I can't enable it since its grey, any ideas how to unlock/enable it? Reason why I wanted to enable it is because it make images/games graphic better. Here a little information about my tablets

- dual core cortex A9 1.6ghz
- quad core 400 Mali GPU
-800*400 resolution
-7' LCD screen
- any advice in how to solve this problem is greatly apprecitaed .

sent from my pipo S1 using xda app-developers app

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