![]() You should now be able to flash and reboot without Guillemot reinstalling itself. Go to Device Manager, uninstall the Guillemot STM DFU Device, checking the box to remove the driver files. If you see "GuiSTDFUDev" in the left box, this issue applies to you, and you should follow the rest of these directions. If you have the above issues, check in Zadig while in this state and "list all devices" in the options menu. Using Impulse RC Driver Fixer does not change symptoms.Attempting to Flash causes "Failed to Open USB Device"."DFU - STM32 Bootloader" is seen in the betaflight dropdown."If you are having trouble flashing a flight controller, and seeing, "Failed to Open USB Device" when trying to flash, check if you have the following symptoms. (Make sure you check the box to remove the driver file or it will reinstall itself!) ![]() ![]() Thanks for this solution! Just adding my fleshed out version here for clarity.
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