Lightbulb help xda users !

hi xda users ...

two days ago i have success to downgrade from 4.3 uk latest rom ''N7100XXUEMK9'' ... to 4.1.2 by mobile odin pro apk and now im in 4.1.2 rom so im wondering if its possible to remove the knox bootloader and get back '''''''the old bootloader''''''''

its not a joke please im in 4.1.2 rom and want to remove knox bootloader and get back the old download mode and old recovery