Does anyone have the Cheerson CX-OF optical flow working with Holybro Kakute F7 mini?

Hello again,

I have a cheerson CX-OF optical flow sensor and I have followed the wiki (https://ardupilot.org/copter/docs/common-cheerson-cxof.html), but it does not work. The HUD is showing bad opt health, and opt_m_x and opt_m_y is at 0. The CX-OF is connected to UART/serial 2 on the Kakute F7 mini.

My settings are:
FLOW_TYPE = 4
SERIAL2_PROTOCOL = 18
EK3_FLOW_DELAY = 80

Do you guys have any ideas? Has anyone gotten this combination to work?

Thanks in advance,
Ervin.