First, I sent letter to FO about 2 weeks prior to interview date, asking for withdrawing N-400 and amend my I-751 to waiver with divorce petition. I went to interview with my ex and my lawyer. Seems like they haven't posted my request letter to the system so the officer wasn't aware about that. I asked for withdrawing N-400. Then, I also asked for change my I-751 to waiver. The officer printed out a page in I-751 form that has divorce waiver check box, and I checked that box, returned it back to him. He then asked me some of the yes-no question in the I-751 form, and didn't ask about our relationship or detail of divorce (it's pending divorce). He said, that all he needs and we can go. He said he would send this to his supervisor for review and he would recommend for approve. It has been 4 weeks and I haven't seen any actions from USCIS. Idk but I strongly think they would send RFE for final divorce decree.