Can't open connexion after flash on RXSR-FC (Omnibus F4 Fireworks V2)

[Mougs]

Current Behavior

Can't open connexion after flash on RXSR-FC (Omnibus F4 Fireworks V2)

Steps to Reproduce

have a RXSR-FC (OMNIBUS F4 Fireworks V2)

• enter boot mode on FC by holding button
• Connect to windows 7 64bit pc via usb (ensure correct driver is elected through Zadig (winusb for stem32))
• use Inav configurator V2.2.1 to flash FireworksV2 Firmware succefully
  reboot fc
• attempt to connect through correct com Chanel (7 for me)
  "Serial port successfully opened ID:1"
  "no configuration received within 10 seconds, communication falied"
  give up, re flash betaflight, open bug issue.

Expected behavior

Using Inav with my FC!

Suggested solution(s)

Patch Inav to allow it to work with this FC

Additional context

I tried to flash with FW FireworksV2, Omnibus F4, Omnibus F4V6 in different version with the same result
My FC works well with Betaflight and Cleanflight

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