hi
root the mobile with this
Universal GB ROOT v9
with sd card in mode recovery
after download the file
No need to extract. Copy the zip file to the root of the SD Card and do not paste it to any folders in the SD Card.
Now switch off your phone
After the phone is switched off, enter into recovery mode. To do this, hold the power, volume up and the home button simultaneously.
Now can navigate through recovery mode only with the volume up and down buttons. Select Update.zip and the root will be applied on your Galaxy Y.
then try to unlock with any box tool for samsung