First of all doing a soft reset just means powering off your phone then back on. It wouldn't erase your memory card by powering off your phone then back on. If you took your mem card out while it was still on it could corrupt data on the card. And even if you did a factory reset, unless you select to erase the card, it won't just erase it. Are you sure it is erased? Have you tried using an adapter to pull up the contents on a computer?