What specific version of Gurboi do you want to use, such as 10.0.0 or 9.5.2? Gurobi_2 is a CVX identifier specifying that it is the 2nd version of GurobiCVX found.
Make sure the version of Gurobi you want is in you MATLAN path. Then run cvx_setup. Each version of Gurobi in the MATLAB path should hopefully be listed under cvx_solver . If not, you are pretty much on your own with Gurobi. I don’t think people here can offer much help. There have been bugs in the CVX-Gurobi interface.