Lost all files and failed update to version 3?

If your files were not stored in the SecureAccess vault you may be able to save some of them using a free recovery app from the list I posted here:  http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/Download-new-version-lost-access-to-all-data-Please-Help/m-p/301789#M5953

If your files were stored in the SecureAccess vault they are probably lost at this point.