My samsung galaxy core 2 not working

okay so recently i installed a stock rom aob1 for my samsung galaxy core 2 g355h and then i installed twrp and root access then i flashed cm12.1 UNOFFICIAL and g-apps file after that it was working nice and fine but then one day it shutted down randomly and it is not booting up now and the mobile only shows the samsung galaxy powered by samsung logo and didnt go any further then i tried to boot it into recovery while charging and no luck it shuts down randomly HELPPPPPPPP PLEASE

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