First get the RomTool, if you have questions start here:
http://discussion.treocentral.com/sh...1&postcount=93
Once you have been able to connect to your Treo via RomTool.
1- Download a copy of your ROM to a Directory (Look to the RomTool Step by Step for help). IE ace
2- Copy the downloaded folder for a backup. IE ace-back
3- Browse to ace and delete FATFS.prc
4- Copy FAT32.prc to ace, If not downloaded get it here:
http://discussion.treocentral.com/at...chmentid=10797
5- Upload directory via RomTool (view Step by Step for RomTool for help)