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I have an Xrotor f7 from honbywing.
I use UART4 for serial rx. Sbus works without problem. But when I change the input to IBUS, the receiver tab is empty.

I am using FS-I6X transmitter, and IBUS is selected correctly in the transmitter.

Receiver Settings:

In the Betaflight Configurator, go to the Configuration tab.
Under "Receiver", set the "Receiver Mode" to "Serial-based receiver (SPEKTRUM, SBUS, SUMD)".
Set the "Serial Receiver Provider" to "IBUS".
Save and reboot.