ROBOTIS officially distributes U2D2 for DYNAMIXEL and it should work well as long as you have correctly installed the driver(usually Windows installs it automatically)
Could you elaborate more on "what did you do and how did it fail" part?
Video or picture would be very helpful in this case.
I think I might be experiencing hardware failure. the device was working fine yesterday. With dynamixelwizard2 the scan feature works and the lights blink in the U2D2 but it never finds a servo.
And when I try to run dynamixel_workbench_single_manager package I'm getting "incorrect status packet"
When scanning for DYNAMIXEL do you see both TX(green), RX(blue) led on U2D2 blink?
What DYNAMIXEL do you use?
Also, go to Options menu and make sure that you are selecting correct COM port and baudrates.