i did the same mistake, because in the How to Article in the documentation the connection of the minimosd is only described with combridge at receiver port. So in wondered also.
Nothing about Flex oder Mainport and setting as Telemetry and 57600 Baud.
And nothing about the protocol, which the revo board use to send his telemetry data to an OSD. Mavlink or UAVTalk or another protocol?
I got help in the forum, now i will correct my manual.
I translated the librepilot into german, now i can understand more details.
greetings
Jürgen, Germany