I'm sorry you are having trouble with SO2.
Can you please verify the exact Android version you are running? Is it 5.0?
Also, it would be helpful to verify the version of SO2 you are running. The current version is 2.3.21.
And finally, we would like to know where you acquired SO2. (Was it the Google Play store, or Samsung or Amazon? or somewhere else?)
FYI - On my Android device, SD0 is the default device memory. When I add an SD Card to my device, it shows up in SO2 as "extSdCard". Is it possible your card is actually present in SO2 with a name other than "SD1"?
Thank you for contacting us.