No SERIAL6_OPTION in Full Parm Llist

First time trying to set up Arducopter. Trying to set it up on a Kakute F7 (non-AIO version). Per all the online documentation i can find I should set the following:

SERIAL6_PROTOCOL 10
SERIAL6_OPTION 7

The problem is I don’t see a SERIAL6_OPTION (or any SERIALx_OPTION) in the full parameter list. Running Arducopter 3.6.7. I checked the release notes and do not see that SERIALx_OPTION was removed.

Why would it not be there?

Thanks

SERIALx_OPTIONS is not implemented in 3.6

You’ll need to run 3.7.0-dev for it.