sm-g928t stuck on samsung screen

tried cert patching the device on OKC firmware,manage to reset efs but when i pressed patch cert,software gave me and error.wich its obviously because of new security….so decided to downgrade the firmware to oj5.downgrade went through all the way.but now phone wont boot up and its stuck on the samsung begging to think it was because i reset efs and didnt flash back up efs before downgrade.FML

is there any solution for this?can anyone help me out or any ideas?