The latest blackrain has a new option to set up tether. When I did mine awhile back,all blackrain had at the time was cydia,rock,and snow. Now it has the tether option. Blackrain was used to jailbreak,but then you could go back into it and choose which ever option you want to install after the JB. For me to get those options would mean for me to use BR(latest one)and JB again to get to new options. That is the only other way I know that I haven't tried,just not sure if it will mess up using BR again.