Lyf ls-4005 - help

Dear all,
i bought new lyf ls-4005 model, and recently i updated it by wireless update in settings, and now i am facing a problem that i am not able to go to recent apps screen so pls help me by showing the way of degrading it and also please tell me HOW TO INSTALL GAPPS IN THE SAME STOCK ROM.............please help me,,,,,,,very URGENT

thanks in advance....

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