The apk works. I am using it too.
Guys after breaking my nervous and taking a deep breathe, I decided to start all over again setting up my phone and this time I finally got it working
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I got my phone back, fixed by Samsung with no cost, they changed the power button which was not at all functionable and as long for the screen problem I had , they told me that it had been moved inside and all they did was to screw it properly onc...
Like you said it, root cwmr and just flash the rom