回複：請問本版懂得Immigrant Law的XDJM, 請問我的I-485還有機會被接受麽？？？

USCIS will take no responsibility for your mistake (attorney, who acts on your behalf, forgot to sign).

I've seen both, accepted later or rejected.
If the letter accompanying the I-485 rejection was included in resubmission, there is good chance.