dldfj

So one of my recommender agreed to write me a letter some times ago and asked me for some supporting materials. But since then I have received no response from him (I emailed him like once or twice). My advisor told me that he was probably waiting for the links sent by the schools' application system so I just sent them out. Now the earliest application deadlines are approaching. I sent him a reminder recently and still no response, and the application portals say that he has not started yet as of today. What should I do?

Hi! I wonder if you are still willing to let us review each other's SOP. I am a computer science major in a US university but I am sure that we still can provide some help to each other.