The menu that opens on pressing the power button has an option "Secure Device". It asks me for a lock code, and no matter what I type in, it says it's a wrong code (I've tried all possible combinations of my PINs I could think of, including the defaults like 0000, 1234, 12345).
Is there any way to reset this thing? It's also weird because I don't think I ever used it before, yet it asks me for a code -- I thought it would first ask me to create a code and then confirm it (after entering the supposedly wrong code, it says "Device not locked").