The flightmode field permanently displays "M_0".

[rxwang04]

Issue details

The flightmode field permanently displays "M_0".the other guys have fix the problem by change the firmware ,but it's still no working whatever i use firmware of mavlink-release.hex or mavlink px4-release.hex

Version

MinimOsd_Extra_Uni.946DV-MAVLINKPX4-release and MinimOsd_Extra_Uni.946DV-MAVLINK-release all try.
the pixhawk has flashed arduplane3.9.4 and i do not know should i use mavlink or mavlinkpx4.
plus:should i check the mavlink mode in the option of ct?i didn't check the mavlink mode because i not sure what it's use for.

Board type

What type of the OSD board you are using?
MWOSD

How "canonical" OSD firmware works?

[ x] Works fine
[ ] The same bug
[ ] Not applicable
[ ] Not tested

TLOG and OSD

Please provide a links to a relevant screenshot/video, TLOG and OSD files that show the issue
https://drive.google.com/file/d/18GXcg5ZiEB17q_RsonX4Y7vr7yO9vEFa/view?usp=sharing
https://drive.google.com/file/d/1pArpHhlyG8MUkhkIs5KJG6pfj7os-G9F/view?usp=sharing
https://drive.google.com/file/d/1jyq2j-GyFBkuFDZxGAlaEm5eE70yrBTn/view?usp=sharing