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Hi Tohoku, I was having the same problem, but I could find a solution.

First, you have to find the file "driver.cc". In there you will find some packet configuration for different types of velodyne lidars, and in some part you'll find the next:

else if (config_.model == "VLP16") { packet_rate = 754; // 754 Packets/Second for Last or Strongest mode 1508 for dual (VLP-16 User Manual) model_full_name = "VLP-16"; }

So, you have to change the packet rate to 1508, which is the packet rate for dual returns. This will solve the problem.

Now, there is another issue, the classification of the last return and the strongest/2nd strongest return, because now they are indistinguishably. If someone have an idea of how to do the classification, I'll be very grateful for the help!