How to use Zadig / How to install STM32 BOOTLOADER
To access the firmware of FPV drones and OpenTX/EdgeTX radios using STM32 processors on Windows PC, it is necessary to install a driver called "STM32 BOOTLOADER".
Normally this driver is not installed automatically and must be installed manually.
Here, we will introduce how to install STM32 BOOTLOADER on a Windows computer using free software called "Zadig".
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Table of contents
Check driver
With the power off, connect the OpenTX/EdgeTX radio to your computer using a USB cable.
Then wait for a while for Windows to recognize the device.
Then open Windows Device Manager.
If you see "STM32 BOOTLOADER" in the "Other devices" column like this, the driver has not been installed correctly. Follow the steps below to install the driver.
Open [Start]-[All apps]-[Windous Tools(Win11) / Windows management tools (Win10)] and double-click "Computer Management". Then click "Device Manager" from the left menu.
Or open [Start]-[Windows System Tools]-[Control Panel] and select [System and Security]-[System]-[Device Manager].
There are two types of USB cables: "For data communication" where all terminals are connected, and "For charging" where only power supply terminals are connected. You need to use "For data communication" to communicate with OpenTX/EdgeTX Companion. Please note that some cables attached to bonus of mobile phone or charger, battery are "For charging".
Install the driver : STM32 BOOTLOADER
Use free software called "Zadig" to install the driver.
Open
Zadig official site (https://zadig.akeo.ie/)
Zadig official site
Scroll the screen and click the words "Zadig 2.8" in the "Download" field.
Explorer will open and the software will start downloading.
ATTN: If Explorer does not open and ads are displayed
If an ad appears when you click the file name, close the ad and click the file name again. Do not press buttons inside the advertisements.
You can download a file with a name like “zadig-2.8.exe”, so double-click it to start.
Then you will see a screen like this.
This is a confirmation screen as to whether or not to check upgrade of "Zadig" itself.
Please select as you like.
And you will see a screen like this.
"STM32 BOOTLOADER" is selected as the driver to install.
If "STM32 BOOTLOADER" is not selected, select [Options]-[List All Devices] from menu, and then select "STM32 BOOTLOADER" from drop-down list.
Then click "Install Driver" button.
If a radio or drone is not connected to the computer, all the text boxes on this screen will be blank and you may not be able to select anything. First, connect computer and radio or drone with the power turned off with a USB cable, wait for a while, and then start Zadig.
Then driver installation will start.
It takes about a dozen seconds to install.
When a screen like this is displayed, installation is complete.
When you open Device Manager, you should see "STM32 BOOTLOADER" in the "Universal Serial Bus Devices" column.