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ESP-Based LNB Update Methods

CoreWingAbout 7 minRemote controlELRS固件更新ESP高频头WiFi

I. Via WIFI

On your computer, start ExpressLRS Configurator, and select WiFi in the Flashing Method option
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Method 1: Manual Upload via Local WiFi

Important

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

  1. On your computer, start ExpressLRS Configurator, ensure the Official Releases tab is active, and select the Released version to flash to your TX module.
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  2. Select the Device Category and Device target that match your hardware.
    image.png
  3. Set the Flashing Method to WiFi
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  4. Set the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country where you will be flying)
  • 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 next enters WiFi mode).
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  1. Click the Build button.
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  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 in the subsequent steps.
  • If you plan to use a phone or tablet to upload the firmware file later, 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.

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7. Press the SYS key on your 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 the script, download the ExpressLRS Lua script and save it to your Radio's SD Card Scripts/Tools/ folder.
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  2. Press Enter to load it, scroll down and select WiFi Connectivity
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  3. Select and press Enable WiFi
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  4. Entering WiFi mode will be displayed, keep this page open.
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  5. Turn on WiFi on your computer, connect to the antenna's WiFi, the password is lowercase: expresslrs.
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  6. After connecting to the antenna's WiFi, your browser will automatically redirect to the firmware flashing webpage. If there is no automatic redirect, manually enter 10.0.0.1 in your browser and press Enter to open the antenna configuration page. On the configuration page, click Load Firmware, select the downloaded bin firmware file, and flashing will start automatically.
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  7. Until the following popup appears on the webpage, which indicates that the antenna firmware has been flashed successfully.
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  8. On your transmitter, long press RTN to exit the ExpressLRS Lua script. Then reload it to check the ExpressLRS firmware version and verify that your TX module has been updated.
    Method 2: Automatic Upload
    This method is only available if you have previously flashed your TX module to use your home WiFi SSID and password, and the module is able to successfully connect to that WiFi network.
    Additionally, MDNS must be working properly for your browser to resolve the address http://elrs_tx.local and load the ExpressLRS Web UI from that address.
  9. Press the SYS key on your 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 the script, download the ExpressLRS Lua script and save it to your Radio's 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 WiFi
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  4. Entering WiFi mode will be displayed, keep this page open.
    image.png
  5. On your computer, start ExpressLRS Configurator, ensure the Official Releases tab is active, and select the Released version to flash to your TX module.
    image.png
  6. Select the Device Category and Device target that match your hardware.
    image.png
  7. Set the Flashing Method to WiFi
    image.png
  8. Set the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country where you will be flying)
  • 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 next enters WiFi mode).
    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. On your transmitter, long press RTN to exit the ExpressLRS Lua script. Then reload it to check the ExpressLRS firmware version and verify that your TX module has been updated.

II. External TX Module via UART

Start ExpressLRS Configurator on your computer and select UART in the Flashing Method option.
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  1. Connect your external TX module to your computer using a USB cable, preferably after removing it from the RC transmitter.
  2. Verify that your TX module is properly detected as a USB to UART device. Windows users can check this in the Ports (COM & LPT) group in Device Manager.
    If the TX module is not detected correctly, drivers are required. Common USB to UART chips used in ExpressLRS modules include: CP210x, CH340, and CH9102 (link to driver download page).
    You can download drivers from here: https://www.silabs.com/developer-tools/usb-to-uart-bridge-vcp-drivers
    image.png
  3. Some TX modules are equipped with switches to change how the USB port interacts with various components inside the module. Ensure the switch is set to the correct position for Flashing TX module via UART.
  • Happymodel ES24TX series modules are equipped with jumper blocks or DIP switches inside the module.
  • BetaFPV Micro modules have DIP switches on the back.
  1. Start ExpressLRS Configurator on your computer, 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 UART
    image.png
  4. Set the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country where you will be flying)
  • Binding Phrase (optional, but strongly 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 next enters WiFi mode).
    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. Unplug your TX module from USB. Return any DIP switches or jumper blocks to their "normal operation" position.
  4. Reconnect your TX module to the external module holder on your RC transmitter.
  5. Use the ExpressLRS Lua script in the tools menu to check if the firmware version has been updated.

III. Via ETX Passthrough

ETX Passthrough is the result of a collaboration between RadioMaster, EdgeTX, and ExpressLRS.
It is only applicable to RC transmitters with internal ExpressLRS modules.
Before beginning, ensure your RC transmitter has the latest EdgeTX firmware version. For the update process, refer to the EdgeTX documentation.

  • TX16S MK2: Update to at least EdgeTX 2.7.0 (f79978b) or EdgeTX 2.7.1 (a55aff0).
  • Zorro: Update to at least EdgeTX 2.7.0 (f79978b) or EdgeTX 2.7.1 (a55aff0). It typically comes with an earlier EdgeTX 2.7.0 version (2bdd4974), which will cause flashing to fail.
  • TX12 MK2: Update to at least EdgeTX 2.8.0 (f6d140e) for full EdgeTX support.
  • Boxer: The factory EdgeTX firmware should be based on an earlier EdgeTX 2.8.0 and does not require an update.
  • BetaFPV Lite Radio 3 Pro: Update to at least EdgeTX 2.8.0 (f6d140e) for full EdgeTX support.
  • Jumper T-Pro: Update to at least EdgeTX 2.7.1 (a55aff0) for full EdgeTX support.
  • Jumper T-Lite V2: Update to at least EdgeTX 2.8.0 (f6d140e) for full EdgeTX support.

Important

Additionally, ensure your RC transmitter has an internal ELRS module. The following steps only apply to RC transmitters with specific ExpressLRS internal modules. Your RC transmitter packaging or box will have a sticker labeled "ELRS", and the JR module cradle will also have a sticker labeled "ELRS", indicating the type of internal RF module the transmitter has.

Before proceeding, you also need to ensure one setting is correctly configured:
On the RC transmitter, select USB-VCP, press Enter, then use the scroll wheel to set it to the correct mode CLI (if the current setting is different), and press Enter again to confirm the change.
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Now follow these steps to update your internal ExpressLRS module:

  1. Connect the powered-on RC transmitter to the computer via a USB data cable.
    screenshot_2025-03-11_17-00-03.png
  2. On your RC transmitter, scroll down and select USB Serial(VCP), then press Enter.
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  3. In your computer's Device Manager, check if your RC transmitter is correctly recognized as an STMicroelectronics Virtual COM Port device.
    image.png
    A yellow warning triangle appearing in the Device Manager, or any prompt mentioning 【Radio Name】 Serial Port, means the driver is not installed
  1. Download the driver package. Unzip and extract the contents of the package, then run/execute (double-click) the installation file (for Windows 10/11 users): https://www.st.com/en/development-tools/stsw-stm32102.html
  2. After installing the driver, check again if the RC transmitter is correctly recognized. You may need to unplug and reconnect the USB data cable, or restart your computer.
    This step typically only needs to be done once.
  1. Launch ExpressLRS Configurator on your computer, 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 EdgeTXPassthrough
    image.png
  4. Set the firmware options for the device.
  • Regulatory Domain (required, select the domain appropriate for your location or country where you will be flying)
  • 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 next enters WiFi mode).
    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.
  3. Disconnect the RC transmitter from the USB port.
  4. Use the ExpressLRS Lua script in the tools menu to check if the firmware version has been updated.
    —— This article is referenced from ExpressLRS Getting Started: https://www.expresslrs.org/quick-start/transmitters/updating/
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