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Before writing the firmware for the first time, you need to replace the STM32
BOOTLOADER driver to ensure that the OpenTX Companion software can recognize
this hardware type and write the firmware correctly. The replacement method is as
follows:
Download the latest version of the universal driver replacement software
Zadig.exe from https://zadig.akeo.ie/
A. In the Windows system, right-click Zadig-2.4.exe and select Run as
administrator
B. In the Zadig software, select Options-> List All Devices to view the device list
C. Drop-down list and find STM32 BOOTLOADER device
D. Click the Replace Driver button (if the driver has been installed before,
Reinstall Driver will be displayed) to replace / install the driver. After the driver
installation is completed, you can use OpenTX Companion to write the firmware to
the radio controller correctly.