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Hi :)

Thank you for your inquiry about Dynamixel-Workbench.

First, MX has provided two protocol version 1.0 and 2.0. Protocol version 2.0 supports sync_read function(It is not supported by 1.0) to simultaneoulsy read data every connected Dynamixel. As you can see, the Dynamixel-Workbench has used itemRead function to compatible with all Dynamixels applied 1.0 and 2.0. So you can change it to sycnRead function after you change firmware your own MX.

Second, I recommend to set baudrate higher than 1M.

Third, you would check usb latency timer. Below issue might be help you.

https://github.com/ROBOTIS-GIT/dynamixel-workbench/issues/129