Xiaobeito, mytwocent etc. come in please: Urgent help about OPT

My friend will have to go home for his father's funeral in recent days. he is in OPT now and just hired as postdoctoral by a university. He has got Offer letter from his supervisor but not yet changed his status into H1B. so how high possibility he can get enrtry visa in China and what visa he can apply for. He appreciates if you can provide more suggestions about his case. thankyou in advance.