You asked what to modify in the build.prop. I answered your question. No need for the smart alec secret society comment. This is a pretty chill group of people that will do anything for anybody. I for one take that kind of stuff personal and would generally not help out, but I'll be nice this time around.
You have to update, modify the boot.img, modify the update apk, or you can delete the Update apk and lose bluetooth.
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