OK give this a go. Change the following CVs in this exact order. This should give you directional headlights on F7.
CV31 = 16, CV32 = 3
----------------------
CV385 = 4
CV31 = 16, CV32 = 8
----------------------
CV385 = 16
CV31 = 16, CV32 = 3
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CV401 = 8
CV403 = 4
CV31 = 16, CV32 = 8
----------------------
CV401 = 32
CV31 = 16, CV32 = 3
----------------------
CV419 = 16
CV31 = 16, CV32 = 8
----------------------
CV417 = 128
CV418 = 0
CV31 = 16, CV32 = 3
----------------------
CV435 = 64
CV436 = 0
CV31 = 16, CV32 = 8
----------------------
CV434 = 1
CV31 = 16, CV32 = 3
----------------------
CV452 = 1
CV31 = 16, CV32 = 8
----------------------
CV450 = 2
CV31 = 16, CV32 = 3
----------------------
CV468 = 4
CV31 = 16, CV32 = 8
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CV466 = 4
CV31 = 16, CV32 = 3
----------------------
CV484 = 16
CV31 = 16, CV32 = 8
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CV482 = 8
CV31 = 16, CV32 = 3
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CV500 = 64
CV501 = 0
CV31 = 16, CV32 = 8
----------------------
CV498 = 16
CV31 = 16, CV32 = 4
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CV261 = 1
CV31 = 16, CV32 = 9
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CV258 = 32
If this does'nt work just program CV8 with a value of 8. That will reset the decoder back to the original settings.