The FrSky RXSR-FC (OMNIBUS F4 Fireworks) uses the ICM20608 over SPI to produce stable flight performance. Integrated with the RXSR receiver mounted on-board in a protection box and the ICM20608 runs perfectly under 32k Gyro loop. Also onboard are a barometer and AB7456 OSD chip for the Betaflight integrated OSD.

The FrSky RXSR-FC (OMNIBUS F4 Fireworks) supports 3-6s Lipo direct input, built-in hall Current Sensor and Power Filter as well. The on Board PDB is tweaked by using 12-Layer PCB design. There is only 0.2-0.5 mohm internal resistance from input to each output pad.

FrSky RXSR-FC (OMNIBUS F4 Fireworks) Specifications

STM32 F405 MCU, Runs Betaflight firmware (supported from v3.2)
FrSky RXSR receiver in protection box
ICM20608 over SPI Bus in dampening box (optional MPU6000)
30.5x30.5 mm mounting holes
Supports Lipo direct plug-in (3-6S)
Built-in sensor damper
Supports 5V 1A BEC output (Buck)
Supports 8V 1A BEC with LC filter output for the camera and VTX (Buck)
STM32 controls OSD chip over SPI in DMA mode (Betaflight OSD)
Built-in hall Current Sensor
Built-in Professional Level PDB
More caps to reduce power noise.

FrSky RXSR-FC (OMNIBUS F4 Fireworks) Features

Tantalum Capacitors can be added to the board (not included)
Solder pads added for VTX and Camera Control (next to Video pads)
The orientation of IMU FPC optimized
Gyro ribbon cable redesigned to fit without extending outside the board
Added an 8v BEC and LC Filter for the camera and VTX power
This board now has 5 UART ports

Q: How to setup the F.Port for RXSR-FC (OMNIBUS F4 Fireworks V2)?

A: Choose and flash the FW in Betaflight: OMNIBUSF4FW

Paste command to CLI:

resource SERIAL_TX 11 C08

resource SERIAL_RX 11 C09

feature SOFTSERIAL

feature TELEMETRY

serial 0 0 115200 57600 0 115200

serial 30 64 115200 57600 0 115200

set serialrx_provider = FPORT

set serialrx_inverted = OFF

set serialrx_halfduplex = ON

save

From: https://www.horusrc.com/en/frsky-rxsr-fc-omnibus-f4-fireworks-v2.html