i changed my status from F2 to F1 too but it was from USCIS. it took around 60 days to change the overall process. I guess if you are planning to join school from fall than you must have been accepeted by university by now. so you still have time. why don't u try. Be safe or atleast know all the rules if you want to change it from other way and in this matter don't just rely on sajha.

good luck