Application within China

I am a Filipino,fr. Philippines and currently holding a bussiness F visa here in China.I just want to asked if is it possible for me to apply a bussiness F here inside the country?or do i need to go back in my home country?My chinese friend told me they can do it for me,so that no need for me to go back home or exit in macao. I am aware that its difficult to apply for the filipinos like me since January this year.My bussiness F will expired this coming May 08,2013.Thank you....