HGLRC Hermes

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Advisory

If you are flashing/updating your TX module via WiFi for the first time from the factory firmware, or from an older firmware, to ExpressLRS 3.x firmware you will first need to flash it to version 2.5.2 then flash it with the Repartitioner binary file (right click, save as/save file as). Should it complain about Target Mismatch, just click Flash Anyway. Only then you can flash to 3.x firmware following method 1 or 2 from the WiFi Flashing Guide below.

Joshua Bardwell has a video about it here.

You can update straight to 3.2.0 without repartitioner or going to 2.5.2 first if flashing via UART.

Flashing via WiFi¶

Target: HGLRC_Hermes_2400_TX_via_WIFI
Device Category: HGLRC 2.4 GHz
Device: HGLRC Hermes 2400 TX

Attention

The methods below apply if you've already updated your Tx modules to 2.x. For modules still in firmwares pre 2.x, you should use 1.x WiFi flashing method to update to 2.x. Or update to 2.x via USB instead.

Method 1¶

With the correct target selected and Firmware Options set, Build your firmware using the ExpressLRS Configurator.

Once it's done, it should open the Target folder for you where the HGLRC_Hermes_2400_TX-<version>.bin file is. Do not close this window so you can easily locate the correct file to upload to the module.

The next steps will require the ExpressLRS Lua script (right-click, save as). Download the ExpressLRS Lua script and save it to your Radio's /Scripts/Tools folder. Insert/attach your module into your module bay and make sure it's not loose and there's a proper connection with the radio (see the Radio Preparation page). Execute the ExpressLRS Lua script by pressing "System Menu" on your radio and then under Tools, select ExpressLRS.

If the script is stuck at Loading..., then there's a chance your module is still in v1.x firmware, your External RF module is not set to CRSF or your module is not well-connected to the module bay pins.

Select WiFi Connectivity from the Lua script and then select Enable WiFi. Press OK once more to activate the WiFi on the Tx Module. Connect to the Access Point the module will create called ExpressLRS TX, with the password being expresslrs.

Using your browser, navigate to the correct page (typically http://10.0.0.1/) and it should show an upload form (you will have to scroll down a bit). You can drag-and-drop the HGLRC_Hermes_2400_TX-<version>.bin file that the ExpressLRS Configurator created. You can also click the Choose File button and navigate to the folder where the firmware was created. Ensure that you have selected the correct firmware file and click Update.

Once the file is uploaded, a pop-up confirmation will show up. Wait for the Lua script screen to close the "WiFi Running" screen and your module should be updated now.

Verify the version and hash in the main screen of the ExpressLRS Lua script.

Update for version 2.0

Once you have updated to firmware version 2.0 or newer, the Web Update page on the Hotspot will get a few updates of its own. It will get the Update progress bar, and a Popup will be shown for Success or Error messages. Additionally, you can configure Home Network SSID and Password if you chose not to use ExpressLRS Configurator to set them. Once these are set, you can use the two methods below.

Method 2¶

With the correct target selected and Firmware Options set, Build your firmware using the ExpressLRS Configurator.

Once it's done, it should open the Target folder for you where the HGLRC_Hermes_2400_TX-<version>.bin file is. Do not close this window so you can easily locate the correct file to upload to the module.

Using the ExpressLRS Lua script (right-click, save as), select Wifi Connectivity then choose Enable WiFi and if you have flashed your Tx Module with your Home WiFi Network details or have set it in the Join Network section of the Update Page, it will connect to the local network automatically.

Using your browser, navigate to http://elrs_tx.local and the WiFi Update page should show up. Scroll down towards the Firmware Update section, as shown below:

Drag-and-drop the HGLRC_Hermes_2400_TX-<version>.bin file created by the ExpressLRS Configurator into the Choose File field, or manually navigate to the Folder by clicking the Choose File button. Once the correct file is selected, click the Update. Wait for the process to complete, and the module will reboot (~1min).

Verify the version and hash in the main screen of the ExpressLRS Lua script.

Method 3¶

Using the ExpressLRS Lua script (right-click, save as), select Wifi Connectivity then choose Enable WiFi and if you have flashed your Tx Module with your Home WiFi Network details or have set it in the Join Network section of the Update Page, it will connect to the network automatically.

Using the ExpressLRS Configurator, select the correct Target and set your Firmware Options. Click Build and Flash and wait for the compile process to complete. You should see a section as pictured below and the Success message marking the update process complete.

Verify the version and hash in the main screen of the ExpressLRS Lua script.

Flashing via USB/UART¶

Target: HGLRC_Hermes_2400_TX_via_UART
Device Category: HGLRC 2.4 GHz
Device: HGLRC Hermes 2400 TX

Attach your USB cable to the module while pressing and holding the recessed button at the back of the module. The location of the button is shown in the image below.

The CP210x Drivers will have to be installed for this to work properly (Windows). Make sure your computer recognizes the module as a CP210x USB-to-UART Bridge device (check Device Manager; or the Actions section of the ExpressLRS Configurator should show another Com Port with Silabs CP210x designation), otherwise, this method will not work.

Important

Check Device Manager on your Windows system before proceeding. Ensure the correct drivers are installed. Some Linux distros might also need drivers. The drivers can be downloaded here.

Using the ExpressLRS Configurator with the correct Target selected and Firmware Options set, hit Build & Flash. Wait for the process to finish, and you should be greeted with the "Success" message.

Verification can be done using the ExpressLRS Lua script. It should show the Version Number and Hash at the bottom, as well as the options you can set. If it's showing "Loading" at the top, check if External Module is set to CRSF for the selected model in your radio, and that the internal RF module is set to off. See the General Troubleshooting section for other ways to determine whether your module is flashed and ready for flying.