Question [Q] [HELP] i9500 Problems

Here i have an Samsung galaxy s4 i9500 from China or Korea. I dont really know where its from. I have problems with the IMEI but that is now fixed, i have rooted this phone but i cant get in Download mode, i have tryed ADB but still nothing happends. Now i have problems with ROMS, When i try to install a rom for i9500 i get the code: (Status 0) Installation aborted. Is it any way to install a rom on this kind of phone?
PS: When i boot up its MyDroid Logo.

Please help.