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Join Date:Joined: Jul 2011
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HALO (the feature) was exclusive to 4.3 AOSPA.
Only a few of my later 3.9x builds had it before we moved to KK based projects.
Unless something has changed I'm not aware of it is not coming back in PA 4.x versions.
HALO))) (the app), is still available in the Play Store and I believe it does work on 4.4 versions.