Issues unlocking k660i

Hi guys, I've been trying for the last 2 hours to unlock the k660i with no success.

I downloaded the D-ultimate unlocker after seeing another poster with the same phone being directed to it on this forum.

I have installed the USB drivers (I think- it went through the process as stated in the PDF) although was unsure which of the 3 driver options I should install. (there were 3 in the program folder).

On running the program I;ve selected K660 as that's the closest model, and now getting the error that it's the wrong boot mode. I would post the error but I cannot for the life of me figure out to how to do it so if you want to see that you need to tell me how to do it.....

I;ve tried booting using C, 2+5, 2+*, and 5....

HELP!