If DYNAMIXEL servo is not detected or some of the servos connected in a chain are not detected then you may fix the issue by doing a firmware recovery using Dynamixel wizard 2.0.
IMPORTANT Make Sure you connect 1 motor only at time for firmware recovery.
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Connect servo over U2D2 to Dynamixel wizard.
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In wizard go to recovery option
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Select your motor model
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Chose your firmware
Walk through the remaining steps (it will ask you to unplug the servo power for few seconds).
- On completion, setup you ID and baudrate as per your requirement because firmware recovery set everything to default settings