Cannot find DJI F450 airframe in pixhawk6c firmware

Thanks for your help ~

I want to use DJI F450 airframe with my Pixhawk6C
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Pixhawk 6c only runs the the PX4 Autopilot firmware version after v1.13.0

However, PX4 Autopilot firmware after [v1.13.0] does not support DJI F450 airframe.

PX4 Autopilot firmware [v1.12.0] still supports DJI F450 airframe [link], but the firmware installation cannot find [px4_fmu-v6c_default.px4]
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Can I just change the

SYS_AUTOSTART = 4011

with the latest firmware in Pixhawk6C?

In the end, I found that the solution
I still choose Generic Quadcopter

Then modify the rotor length to 0.22. (m)
My UAV frame is 450 mm
The unit in the actuator is meter.
Therefore, the value is 0.45 / 2 is about equal to 0.22 (m)