Prestigio Grace S5 bootloop - Android Q&A, Help & Troubleshooting

Hello.
Yesterday when i tried to unroot my device it didn't turn back on ever after when I did so, it is always stuck on bootlogo, It was runing android 5.1.1 and I also tried to wipe data/factory reset and wipe catche, but nothing works.
Need help as soon as possible please.
Phone specs:
Model name: PSP5551 DUO
Android: 5.1.1 Lollipop
Procesor: Quad-core 1.3 Ghz
RAM: 1GB

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And also I wanted to mention that I even tried to go in bootloader from recovery options in my phone, and as soon as I try, it stucks with small message in bottom left corner ' =>FASTBOOT mode... '
Please please, I really need an urgent help, because I don't have any other phone for calls to use while this is broken.

Anyone please help me

#Bump
Still waiting for help

Anyone?

Prestigio Grace S5 LTE

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Hello.
I am new to xda so sorry if i posted this thread in wrong place.
I don't live in US and i am sorry if i made any grammar mistakes .
Yesterday i rooted my phone and i tried to find kit kat rom for my device. I had no luck but i found "solution" i decided to install kit kat UI. Then every time i pressed home button android asked me which launcher i want to use. That annoyed me so i decided to UNINSTALL old (stock) launcher via app called APK master. Everything worked fine untill i installed new boot animation. After reboot my phone is in infinite boot animation loop. Please help me!
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RAM: 512 MB
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