So you want to flash Frsky RX firmware, but too lazy to take your quad apart? You can flash it through your flight controller, just like how you flash your BLHeli ESC’s using FC pass-through.
Important: “FC Pass-Through” requires SmartPort connected and working correctly in the first place.
Further Reading: Frsky Receiver Options for Mini Quad
Advantages of Flashing Frsky RX via Pass Through
You can flash Frsky receivers using your Taranis, but there are some advantages to using FC pass through:
- No need to remove your RX from the quad
- No fiddling with connectors
- Not everyone has a Taranis TX for flashing TX
Download FRSKY Tool or “Tool-FrSky update sport” from here: https://www.frsky-rc.com/frusb-3-fuc-3/
Download receiver firmware from: http://www.frsky-rc.com/download/?sort=Firmware&cate_id=12&pro_id=0; Note the file you will flash. EU version has “LBT” in the filename, international version has “FCC” in the filename
- Plug in the your flight controller via USB, and connect to Betaflight Configurator. Go to the Ports tab and note the port you are using for SmartPort.
- Go to CLI, type
serialpassthrough [UART-1] 57600(for example, if you are using UART 3 for SmartPort, “UART-1” is 2, and you should type
serialpassthrough 2 57600)
- Disconnect from Betaflight Configurator
- Power off your quad, disconnect USB and LiPo battery, make sure RX is not powered
- Open up FRSKY tool (make sure you right click the icon, and run as administrator). Select the RX firmware file
- Connect USB, and plug in the LiPo to power on your FC and RX
- If the FRSKY tool detects the receiver successfully, it should now display the current firmware version and hardware version number
- You can now download and flash, it will take about 2 minutes
You will need to bind your TX and RX again after flashing receiver firmware.
Not Working? Some Troubleshooting
It is very important that the receiver is turned off before opening the Frsky Tool.
You should power your FC and RX with a LiPo battery, otherwise the RX might drop out during flashing due to insufficient power.