What is the problem of my Samsung GT-S5280????

The first problem is I changed my systemui from my groupmate on fb of my android phone brand and when I reboot my phone, it stucked in screen with "Android is Uprgrading" then I try to flash a stock firmware on my phone but the procedure is failing everytime I trying to flash. So it get softbricked, (the screen with exclamation mark and cp ----> pc monitor, encounter an etc...) then I flashed a cwm in these phone, a successful operation. So I go to cwm recovery and I wipe all data and reboot my phone but the samsung and blue surroundings are missing, only the "over the horizon" song is ringing but no bootlogo? What is the problem? I always trying to flash stock rom but always fail, I downloaded 3 stock rom but, always failed. :( please help me sir, I love my phone so much!! :(:(