I am a newby to drones and recently bought the LT105 Micro and the Turnigy Evolution.  I also bought the FS-A8S and for the life of me, can't seem to get it working.  It is receiving power and based on the solid red light, I'm pretty sure it and it is bound to the receiver, but I can not get the signal to show in betaflight, arm, or anything.  I have watched every video I can find and read every post I can find.  I have the ports setup in betaflight with UART1 and UART3 with Serial RX.  I have set the configuration to Serial and SBUS.  I have PPM and Sbus set on the Evolution.  I have tried changing configurations, updating, and every other thing I can think of, but still nothing.  I had no problem getting the TGY-iA6C to work, but this thing is driving me crazy!  I just want to fly   If anyone has any tips or ideas I can try, I would greatly appreciate it.  Thank you in advance.

Connect the i/S-BUS output to UART3 RX and connect the 5V and GND connections to the 5V and GND pins on the same UART.
Set the receiver to output i-BUS (while bound, hold down the bind button for two seconds so that the LED turns off for 1 second and then flashes twice) and on your radio, select PPM and i-Bus on the Output Mode page. In the Betaflight configurator, set UART3 to serialRX. No other UART should be set to SerialRX. Save. On the Configurator tab, set Receiver Mode to RX_SERIAL and the Serial Receiver Provider to IBUS. Save.

You should now be able to see your channels moving in the Receiver tab.

unseen! You are my new hero!!! The key was the UART3 on the flight board. On UARTS 1 & 2, the RX is the 3rd pin, but on UART3, it is the RX is the last pin! Thank you thank you thank you thank you thank you!!!

Great to hear you have it working now!