I put my thumb drive into the computer and tried to find the saves folder etc so that when I click appears device not found of which already put the pen drive
Make sure no other programs are open (first) that look for your device, run as admin as well. Keep in mind that any USB drive that has been formatted with the April Public Beta Dashboard will no longer see their USB drive in 360Revolution -- instead you can see the contents of the files/folders yourself in Windows Explorer.