How to use Zadig: How to install STM32 BOOTLOADERTo 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".
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
If you have never connected a radio to your computer before, you may find that on this screen all the text boxes are blank and you cannot select anything. First, connect computer and radio with the power turned off with a USB cable, wait for a while, and then start Zadig.