hello my indian friend has M visa. What document need for the extension?

1. His valid passport and current M type.
2. Registration Form Of Temporary Residence
3. 2 passport photos (4.5CM×3.5CM）
4. copy of Chinese company's business license
5. copy of Chinese company's certificate of organization code
6. application letter from Chinese company with its official stamp
7. copy of previous invitation letter issued by duly authorized Chinese entity or organization.

I think he should apply for the extension with the help of his Chinese partner.