I know this is an old thread but by adding 5AB to your VO you are doing the exact opposite. 5AB is a DECODING option for 2 stage BFD. In my country Japan, it’s there in the VO for some reason, and all we have to do to get BFD is to delete 5AB from VO and SG_CODIEREN FRM with a blank .MAN file. It is very possible that you had BFD from factory but by adding 5AB you just decoded it.
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