I used the MinimOSD-Extra and got it going quite well - I saw a similar issue when I flashed the wrong version.
- Download the osd_latest.zip and unzip, run in windows.
- Use OSD_Config.exe to flash the character updater first, Character_Updater_FW.hex
- Then flash the desired character set, I used MinimOSD_2.4.1.4-digital.mcm
- Next, flash the desired firmware version number - usually the latest - BE SURE to choose the “mavlink” and not the PX4 version, MinimOsd_Extra_Uni.934DV-MAVLINK-release.hex
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- this is where I originally went wrong, incorrectly chose PX4 instead of mavlink
The PX4 version worked but the flight modes showed like yours (above), when I changed to Mavlink version everything worked as expected. And the spinning prop shows next to flight modes when armed!