Financial aid reconsideration and enrollment deposit

Does anyone know if financial aid for incoming freshmen can be reconsidered/appealed AFTER the enrollment deposit is submitted? My son is eager to start the housing process which requires the deposit but we would like to ask for a FA reconsideration. Basically, does the deposit mean you are fully accepting the FA as presented? Thank you.

housing assignment order up until May is a lottery system so no point in turning it in early