And? It doesn't works?
When the program or tutorial says that press C button and connect the phone, you need to turn off the phone, remove the battery, wait a few seconds, put the battery back, but DO NOT turn on. Press and hold the C button on phone, connect the cable. When you see some progress in program(XS++, SETool2 Lite, etc.) release the C button.
By the way first press the button(e.g. the Connect button) in program, and AFTER that connect the phone.