FS-x6b not communicating with F4 V3s Plus

F4 V3s Plus does not have IBUS port. Tried ti use, as advised a free UART. Inmy case RX 6 and set:

serialrx_halfduplex=OFF

serialrx_inverted =OFF

I did set the receiver to IBUS as well as on my FS-i6 RC.

That did not solve the problem.

I tried another app

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