@slycooper124 There is a compatibility list for drives that work, it's on the original xbox subreddit wiki. This is it.
@Onknight If that doesn't work try using a FAX Formatter from your desktop. If that doesn't work, you may just have an incompatible phone, or you aren't rooted (I doubt this scenario).
Kind of. For me, I made the drive in DriveDroid following the guide and then formatted it to FATX using the Xbox itself and then transferred the exploit using XPlorer360.
I had trouble with drivedroid not working correctly, that was until I followed the ogxbox wiki on reddit, specifically using this page explaining how to configure drivedroid and this page explaining how to use the save game exploit.