How to Flash Firmware for an ELRS Receiver via FC

If the receiver functions normally, please refer to the follwing steps,

1. Wiring for FC and Receiver:

Please connect the ELRS to the FC, as shown in the follwing diagram,

2. FC settings

a. Enable the Serial RX for the corresponding UART

b. Set the receiver protocol to "CRSF".

3. Firmware flashing

a. please download the latest ELRS-Configurator

（https://github.com/ExpressLRS/ExpressLRS-Configurator/releases）

b. please open the Configurator and enable the Firmware Version

Select the firmware version and model of the firmware that needs to be flashed "SpeedyBee 2.4 GHz RX".（Please select the firmware according to the actual receiver used.）

c. please choose the Flashing Method “BetaflightPassthrough”

d. set “Device options ”

Plese select and tick the features needed.

If you are not sure about the features, please refer to the following settings.

e. Please select the FC

f. Click "Flash"

After its completion, the ELRS Receiver Firmware Flashing is completed.

Note: When flashing the firmware for the first time, it will take some time to compile the firmware.