Visa enquiry. Change S2 type to M type

I am currently in china on an S2 Personal type I am needing to change it to a Buisiness M type is there a way that I can do this within PRC or will I need to leave PRC to apply for the entry permit or does any one know of any agent within PRC that can assist with this application.

This is an urgent request as my current S2 type is coming to an end