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ESP-Based Receiver Update Steps

CoreWingAbout 5 minRemote ControlELRS固件更新ESP接收机Passthrough

I. Through passthrough

  1. Ensure you have correctly completed receiver wiring and your flight controller is configured.

Important

This is an important step to ensure a successful update. If you have not completed these operations, please go back.

  1. Connect the receiver to the flight controller board and connect to the computer via a USB data cable.
  2. Launch ExpressLRS Configurator on your computer, ensure the Official Releases tab is active, and select the Released version to flash to the RX module.
    image.png
  3. Select the Device Category and Device target that match your hardware.
    image.png
  4. Set the Flashing Method to BetaflightPassthrough
    image.png
  5. Set the firmware options for the device.
  • Regulatory domain (required, select the domain appropriate for your location or country)
  • Binding phrase (optional but highly recommended. Note this phrase as it should be the same on your other devices, otherwise they will not bind or sync)
  • Local WiFi network credentials (optional. Will be used when the device enters WiFi mode next time).
    image.png
  1. Click the Flash button.
    image.png
  2. Wait for the process to complete. A green success bar will appear in ExpressLRS Configurator.
    image.png
  3. After a few seconds, the LED on the receiver should return to slow blink LED mode.
    LEDSEQ_DISCONNECTED

II. Through UART

  1. Connect the receiver to a UART adapter. You need to disconnect the receiver from the flight controller and connect it to a UART/FTDI adapter. As shown in the figure below.
    image.png
  2. If your receiver has a Boot Pad instead of a Boot Button, solder the Boot Pad together or ground it. If your receiver has a Boot Button, find it and press it.
  3. Insert the UART adapter into a USB port on your computer.
  • The LED on the receiver should be solid. If it is blinking rapidly, repeat the previous step.
  • After the LED on the receiver is solid, release/unpress the button on the receiver (if any).
  1. Drivers need to be installed when using the UART adapter for the first time. Common USB to UART adapter chips include: CP210x, FTDI FT232, CH340 and CH9102 (driver download page links).
  2. Go to your computer's Device Manager to check if the UART adapter is correctly detected as a USB to UART device.
    image.png
  3. Launch ExpressLRS Configurator on your computer, ensure the Official Releases tab is active, and select the Released version to flash to the RX module.
    image.png
  4. Select the Device Category and Device target that match your hardware.
    image.png
  5. Set the Flashing Method to UART
    image.png
  6. Set the firmware options for the device.
  • Regulatory domain (required, select the domain appropriate for your location or country)
  • Binding phrase (optional but highly recommended. Note this phrase as it should be the same on your other devices, otherwise they will not bind or sync)
  • Local WiFi network credentials (optional. Will be used when the device enters WiFi mode next time).
    image.png
  1. Click the Flash button.
    image.png
  2. Wait for the process to complete. A green success bar will appear in ExpressLRS Configurator.
    image.png
  3. After a few seconds, the LED on the receiver should return to slow blink LED mode.
    LEDSEQ_DISCONNECTED

III. Via WiFi

3.1 Manual Upload via Local WiFi

Important

This method is only available if you have previously flashed or configured the TX module to use your home WiFi SSID and password, and the module can successfully connect to that WiFi network.

  1. Insert the receiver into the flight controller and power the flight controller using a data cable. On your computer, launch ExpressLRS Configurator, ensure the Official Releases tab is active, and select the Released version to flash to the TX module.
    image.png
  2. Select the Device Category and Device target that match your hardware.
    image.png
    3. Set the Flashing Method to WiFi
    image.png
  3. Configure the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country)
  • Binding Phrase (optional but highly recommended. Note this phrase as it should be the same on your other devices, otherwise they will not bind or sync)
  • Local WiFi Network Credentials (optional. Will be used when the device enters WiFi mode next time).
    image.png
  1. Click the Build button.
    image.png
  2. After the build process is complete, a Temp folder window should pop up.
  • Do not close this Temp folder as this is where you will get the firmware file for the next steps.
  • If you plan to upload the firmware file later using a phone or tablet, copy the firmware file to your device.

Important

With the release of ExpressLRS 3.3.0 and ExpressLRS Configurator 1.6.0, only one file firmware.bin will be displayed, use this file for the subsequent steps.

image.png
7. Put your receiver into WiFi mode.
Method 1: Using Auto WiFi Mode

  1. Connect the receiver to the flight controller board, then power the flight controller board.
  2. Wait for at least 60 seconds or long press the BAT key on the receiver for 5 seconds, the LED will change to fast blinking mode or green breathing LED mode (for receivers with RGB LED), indicating it is now in WiFi mode.
  • The Auto WiFi On Interval setting controls how long the device waits to enter WiFi mode after power-on and without receiving valid CRSF packets.
    LEDSEQ_WIFI_UPDATE
    Method 2: Using ExpressLRS Lua Script
    The receiver must be bound to the transmitter, for detailed steps please refer to: https://docs.corewing.com/plane/inav/settings/rc/elrs-bind.html
  1. Press the SYS key on the transmitter, the radio will display the tools menu where you can find the Lua script.
  • Older radios or radios with only one menu key must long press the Menu key to access the System Menu.
  • Refer to your Radio user manual for instructions on how to access the system menu.
  1. Scroll down and select ExpressLRS. If you cannot find this script, download the ExpressLRS Lua script and save it to your Radio SD Card Scripts/Tools/ folder.
    image.png
  2. Press Enter to load it, scroll down and select WiFi Connectivity
    image.png
  3. Select and press Enable RX WiFi
    image.png
  4. The receiver LED will change to fast blinking mode or green breathing LED mode (for receivers with RGB LED), indicating it is now in WiFi mode.
    LEDSEQ_WIFI_UPDATE
  1. When the receiver is in WiFi mode, turn on WiFi on your computer → connect to the ExpressLRS RX receiver WiFi, the default password is lowercase 'expresslrs'.
  2. After connecting to WiFi, wait 10 seconds and a browser will automatically open and navigate to the 10.0.0.1 page; if the browser does not open automatically, you can directly enter 10.0.0.1 in the browser address bar to access the receiver.
  3. Go to the UPDATE page, click "SELECT FIRMWARE FILE" to load the file. In the pop-up window, select the downloaded firmware archive, and the webpage will automatically start flashing the firmware.
    image.png
  4. Until the following pop-up appears on the webpage, indicating the receiver firmware has been successfully flashed.
    image.png
  5. After a few seconds, the LED on the receiver should return to slow blinking mode.
    LEDSEQ_DISCONNECTED

3.2 Via Auto Upload

  1. Put the receiver into WiFi mode, for detailed steps refer to point 7 above.
  2. Insert the receiver into the flight controller and power the flight controller using a data cable. On your computer, launch ExpressLRS Configurator, ensure the Official Releases tab is active, and select the Released version to flash to the TX module.
    image.png
  3. Select the Device Category and Device target that match your hardware.
    image.png
    4. Set the Flashing Method to WiFi
    image.png
  4. Configure the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country)
  • Binding Phrase (optional but highly recommended. Note this phrase as it should be the same on your other devices, otherwise they will not bind or sync)
  • Local WiFi Network Credentials (optional. Will be used when the device enters WiFi mode next time).
    image.png
  1. Click the Flash button.
    image.png
  2. Wait for the upload to complete. A green success bar will appear in ExpressLRS Configurator.
    image.png
  3. After a few seconds, the LED on the receiver should return to slow blinking mode.
    LEDSEQ_DISCONNECTED
    ———— This article is referenced from ExpressLRS Getting Started: https://www.expresslrs.org/quick-start/receivers/updating/#esp-based-receiver-updating-methods
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