1. Download gingerbread unroot.zip file from this 4shared link. Again, as in rooting, you can download gingerbread un-root file directly from your phone by entering this link or you can download it in your PC and then transfer it to your phone. Link: http://www.4shared.com/zip/8Q7kdWmX/gingerbread-unroot.html.
  2. Save this gingerbread un-root file in the root directory (the main directory and not in any folder) of your SD card.
  3. Power off your Samsung galaxy pro.
  4. Press “Power” + T together to enter into recovery mode. You will notice that your galaxy pro will boot for couple of times before entering to recovery mode. Don’t panic, just wait and keep pressing the key combination.
  5. Use the volume “down” key to go to the 2nd option on screen which says : apply:sdcard:update.zip
  6. Click on the “HOME” key to select this option.
  7. On next screen you will see gingerbread-unroot.zip, go down to that option by pressing the volume “down” key and press home key again to select.
  8. Some kernel codes will run and wait for the notification that says: “Install from SD card complete”.
  9. Press on the “HOME” key again on the option “Reboot Now”. Wait for your galaxy pro to restart.
*IF THIS DOESNT WORK, FACTORY RESET FIRST YOUR DEVICE THEN DO THIS INSTRUCTIONS AGAIN.