I got a problem with the Matek F405 Wing.
If only one Lipo battery is connected, no telemetry is transmitted.
I start the FC by connecting USB (notebook mission planner) and then connect the battery to the telemetry connection. (also without USB)
I already tried different UARTS and another receiver.
the same receiver with the same level converter works right away on an old Pixhawk.
Except for the “starting difficulties” the FC works flawlessly.
RC: Xlite with R9MM+ with Flex firmware
I use the UART Option 10 and the Yapuu telemetry cable.