I have 3.10 OE-A' and have made an ISO folder on the root of the mem stick. I have tried putting both .iso and .cso files in that folder, but when I look under memory stick I don't see anything there. I tried backing up my mem stick then formatting it and it created everything except an ISO folder, it even created GAME310 when I use GAME and GAME150 for 310 and 150 eboots. What is going wrong? I have tried searching but no one seems to have same problem as me. Thanks. Just to say No UMD in disabled.