every make is programmed/flashed  differently, some are possible with our tools and some are not and need to be done on line with a j2534 pass thru device and an on line sub. the first step is to read the forum as much as possible, most questions have already been answered a few times on the forum. the forum is devided  into many sections, i will start with the fAQ section first as there are many things you need to know, then read the rest of the forum. also specify as much as possible so that you can better be helped.  also try the search bar it is  a powerful feature. good luck.

 Ede65 is right. And also you have to inform what you really need to do and brands you want to work, in order to help U.