I recently bought a Galaxy S2 on eBay. I have tried to open it, but every time I get the error message "The device was reset. To continue, sign in with a Google Account that was previously synced on this device". Does this mean that only the previous owner can login to the device? Short of returning the device to him, is there any way I can login and register it to my account? And if I return it, what does the previous owner have to do so that I will be able to take ownership?