TWRP works fine,but I can't flash any rom on my Samsung GT-S6312

Hello everyone,I'm Tom from Croatia and this is my first post here.I'm trying to flash new rom on my Galaxy Young s6312 using TWRP.I have two roms on my sd card,one is Bulldroid-v2.zip,and another one is Remix v1.zip.When I flash bulldroid,it takes maybe 20 secs to finish flashing,and it says "successful",but after reboot the phone it goes only to the point where it displays it's own name and make,and would stay there forever.When I flash remix,it fails every time.Please give me some idea how to solve that issue and flash my phone successfully....Thanks....

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