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How to Flash Runcam VRX Using an SD Card

This is a short guide on how to flash RunCam VRX using an SD card.

Step 1: Download the firmware image - Download from GitHub

Step 2: Write the image to the SD card

  • Extract the archive with the image.
  • Use Win32 Disk Imager to write the image to the SD card.

Step 3: Insert the memory card into RunCam VRX

  • Insert the prepared SD card into the slot on the device.
  • Connect the battery to the VRX.

Step 4: Activate the flashing process

  • Push the "20/40 MHz" button once to the right on the joystick.

Step 5: Completion

  • Wait until the flashing is complete (the indicator will stop or the device will reboot).
  • Disconnect the battery.
  • Remove the SD card.

⚠️ Attention: Do not turn off the power during flashing!

How to Recover Runcam VRX After a Failed Flash

If the internal memory (eMMC) was completely erased during a failed firmware flash, the VRX device may not even boot to the command line. But don’t worry — you can easily recover or “unlock” your VRX using this guide.

Step 1: Prepare the firmware

  • Make sure you have the correct firmware image for your device (Ruby or SBC). It should be a regular image, NOT an emmc_flasher.
  • SBC groundstation - latest releases

Step 2: Download required tools

  • Download RKDevTool and the driver from Chipsee’s official website.

Step 3: Install the driver

  • Before using RKDevTool, install the driver for the device.

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Step 4: Configure RKDevTool

  1. Open the configuration file in the RKDevTool_Release_v2.93 folder.
  2. Change Selected=1 to Selected=2 to switch the interface language to English.

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  1. Right-click in the program window and choose "Clear items" to clean the list.

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Step 5: Add the loader

  1. Make sure the file name is loader.

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  1. Download the loader .bin file from the official Radxa website.

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  1. Right-click in the program and select "Add item" to add the loader file.

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Step 6: Add the firmware image

  1. Provide the path to your firmware image.
  2. Double-click on the storage field and choose EMMC.
  3. Make sure both items are checked, and that "write by address" is enabled.

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Step 7: Switch the VRX to bootloader mode

  1. At the bottom of the device near the HDMI port, locate the small button.
  2. Press and hold it using a needle or paperclip.
  3. While holding, connect the power to the VRX, wait 2 seconds, then release the button.
  4. Connect the VRX to the PC via USB Type-C. The program should detect the device.

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Step 8: Start flashing

  1. Click the "Run" button in RKDevTool.
  2. Wait until the process completes. Once done, a Download complete message will appear.

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Step 9: Final Steps

  1. Turn off the power and disconnect VRX from the PC.
  2. Turn the device back on. VRX should now boot in normal mode.