i9506 does not start after flashing a custom ROM (worked before with cm 12.1)

Hi guys,

today i tried to flash another custom ROM. I had running a cm12.1 build to that point. However after successfully flashing ROM][16-08-15][GT-I9506][5.0.2][PORT] Darklord Galaxy S6 v3.0 for S4 using the latest philz recovery, my phone wont do much more than displaying the Samsung Galaxy S4 logo. I can boot into download mode or recovery. But the rom wont boot. Any help is appreciated. Not sure what infos you need, so plz just tell me if you need more info to help me.

thanks akku