I noticed a similar question In the US as an F-1 student, filed the wrong form last year. But I have something additional to ask.
I am a F1 student nonresident alien and, in 2014, I filed form 1040EZ instead of 1040NR-EZ. I received a refund as well. Now I want to correct this mistake. In the referenced question I found that I have to complete 1040X. Do I just complete form 1040X completing biographical page? Or do I have to file form 1040NR-EZ as well? Also, I am confused how the process works since I already received refund. Any comments?