S1 residence permit extension without recommendation letter

My husband is a PhD Student in Harbin, China. And I have recently joined him with S1 visa since March 2017. Due to my husband's passport expiration, our residence permit ends in September 2017 and we are going to extend our residence permit.

When I first came here on March 2017, we both notified the university and the university gave a recommendation letter for me stating that I am a family member of my husband. This letter is to support me to fulfill my residence permit documents for the public security bureau( PSB) which then granted my current residence permit.

However, due to a sudden change in the policy of the university, currently now the university will not give anymore recommendation letters/relevant materials for handling residence permit for accompanying family members of their foreign students.

Will it still be possible for me to extend my residence permit without the supporting letters from the university? If so, What are the documents that I must prepare to extend my residence permit? please reply. Any advice would be highly appreciated.