So I did factory reset like was suggested after I backed up my original rom and settings to my pc. Then I rooted the phone with gs3debugfsroot from xda developers page. Then unlocked my bootloader with ezunlocker. Verified unlock and root... all good. Downloaded cleanrom 5.0 from downloads and dropped it in my sd card. Booted to recovery and installed from sd card. Its starts doing its think like its supposed to and then I get this...
E: signature verification failed