Unlocking SD card
If this does not make the SD card work for you then remove the paper and put it on the side opposite to where you had put it earlier. Then if you want to really unlock the SD card, check the switch which is on the left side of the adapter. This has to be toggled. This is the necessary step for unlocking the SD card which does not have a switch. In place of this one can put the SD card in an SD adapter that is unlocked and get the data which is stored on it. The SD adapters are similar to SD card and the system for switch is almost the same.