CLI Issue in Cleanflight

[anglovirtual]

Hi,

I've been trying to update the influence of my motors for my Nighthawk Pro 280 in the CLI of Cleanflight as its not a true X quad, but I keep getting an unknown command error. Anyone know what I'm doing wrong?

Here's the settings I'm trying to enter that my version of Cleanflight doesn't recognise:

mixer QUADX
mmix reset
mmix 0 1.000 -0.814 1.000 -1.000
mmix 1 1.000 -0.814 -1.000 1.000
mmix 2 1.000 0.814 1.000 1.000
mmix 3 1.000 0.814 -1.000 -1.000

Thanks in advance!