Pyserial and dronehacks software flashing

[matt@tcdrones]

I have a yaw motor failure on Mavic 3. After replacing 2 signal cables and 2 yaw motors, the problem persists. Software flashing with pyserial is like there is no drone connected. Dronehacks.com sees the drone and recommends the wm260 file to download. When I select the file to download, it just doesn’t do anything. I’ve used both methods successfully on other drones. I can’t figure this out. Gimbal basically does nothing, no video, pitch and roll channel motors are energized, yaw is not. I have standard gimbal stuck error codes. I’m wondering if the motherboard got messed up in the crash. I would assume if the motherboard was bad, I would get diferent error codes. Any help would be appreciated. My client has spent enough on this drone I really want to get it flying for him.