R9MM OTA ACCST won't bind with multimodule v1.3.3.0

[sdellava]

Hallo. I've bought a R9MM OTA and flashed successfully with my T18 Pro with latest fw version (190201 2019-11-01).

I've done these steps:

• installed the R9_MM_LBT_Fport.frk
• powered up the fc pressing the binding button on the rx
• both red and green light turn on
• selected MULTI - FrSkyR9 - 868MHz on the OpenTX
• clicked Bind

Nothing happen on both side.
Turned off and on both. Rx red led is on meaning that the rx in not bind.
Tried again with other fw version with same results.
Re-flashed the internal multi module of my T18 (just in case it could be wrong).
No succuess.

I've read many post regarding this issue and it seems that the same radio can bind with a original FrSky radio, so I guess there is issue in the multi module fw.

Any clues?

[sdellava]

Just for documentation, I've solved.

The issue was cause by the FrSky fw. Even if it is not intuitive, we need to install the FLEX version of the fw.