Umm, download the beta firmware, it will have 4 files:
Then download your existing firmware, which will have 5 files (AP, BL, CP, CSC and Home_CSC). Use Home_CSC from your 2nd download rather than CSC from the beta folder.
So use the following with Odin3:
Important: Before you do this, turn secure boot on with a pin/pattern (otherwise you'll be asked for one after you flash). This can be disabled after the first boot.