Info 2 [Q] Samsung galaxy s2 lte e110s help!!

hey guys i have a rooted s2 e110s using kingo root. i am not sure if the bootloader is unlocked still i tried to flash custom roms and it stucked at samsung screen, i wiped cache and dalvik cache but still stucked there. So i flashed back to the stock rom and its normal now. Does it mean the bootloader hasnt unlocked yet? how to check and unlock it? or all i want is to flash the custom rom so please help!! i dont like the touchwiz so.
Thanks in advance!