[SOLVED] 3.5.0-rc4 Looses frame type on reboot

@varesa wrote:

I just got a Pixhawk Mini (=pixfalcon?) from 3DR and flashed 3.5.0-rc4 on it.

If I try to arm the unit I get the following message:
"PreArm: Motor Interlock Enabled"

It doesn't matter if I have a CHx_OPT set to Motor interlock or not and if I have a channel set it doesn't matter if it's on or not.

EDIT: Found this possibly related thread: http://discuss.ardupilot.org/t/3-5-0-rc2-on-heli-with-pixracer-cant-clear-motor-interlock-solved/15734/7
And looks like that setting the frame type from HELI to HEX did not get saved so it expected a valid input on CH8

EDIT2:

I can't seem to save the frame type/class setting. I can select it in Mission Planner Initial setup or set the parameters manually but once I reboot the controller the frame is set back to a heli. What should I do?

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