mLRS R9M TX as RX - INAV Problem - UART Invert

[kolabuzlu]

Hi. I have two Frsky R9M TX Modules. Flashed one of them with mLRS tx firmware, the other one with mLRS rx firmware to use tx as rx. In fact, I want to use these two just for telemetry, GCS purposes, not RC link. Using seperate ELRS pair as RC link.
In Ardupilot, everything works without any problem. R9M module which works as RX on the plane to send telemetry, has four pins in front of it to be used as Uart connection. But tx and rx are inverted. Inverting them in Ardupilot (serial_options) on H7 board solves the issue and Mavlink works perfect.
But in INAV, without any success.
Tried telemetry_inverted as ON and OFF both, wired to different uarts, played with baud rates. Nothing happens.
Do I strictly need to use external hardware inverter to solve this? Is INAV capable to do this inversion on H7 boards? Or am I missing something?

Sorry for taking your time.

Regards to all community.

Derin