Marshmallow bootloader?

Hi guys,
I have just been trying to go from a custom rom (Older Dr Keaton Rom) to marshmallow.
I downloaded the marshmallow firmware and after flashing in PC Odin I now get " Firmware Upgrade encountered an issue.Please select recovery mode in Kies & try again".

I have no certainty but suspect that it needs a different bootloader?
This is the marshmallow stock uk rom,

N910FXXS1DPH8_N910FO2U1DPG2_N910FXXU1DPB1_HOME.tar

I have a N910F Note 4.
Can anyone help me get this back to a working stock rom?

Thanks in advance.

from xda-developers http://ift.tt/2c7uRsx
via IFTTT