Before updating you will do these few steps :
1.Back up all the important data and contacts of your device using ASTRO FILE MANAGER.
2.Charge your handset to 80% or more.
3.Enable USB Debugging on your device by heading to Settings>Applications>Development>USB Debugging
4.Disable all the applications like Antivirus software,Samsung Kies PC suite.
Disclaimer: We are responsible for any damage that might be caused to your device during this process though the possibility of any damage is negligible. Try this at your own risk. Also note, updatin your phone will void your warranty.
Updating Instructions :
1.Download Android v2.3.6 GingerBread XWKTN Firmware and Odin in your computer.
2.Open Odin in your computer and power off your handset so that it can be easily entered into Download mode.
3.Holding both simultaneously the Volume Down key,Ok key and press the Power button. Warning message will be shown to you and now press the Volume Up key to continue enter the Download Mode.
4.Attach your handset to your PC with USB cabel and then you see that ID:COM section of Odin will get yellow which means that you successfully installed the drivers.
5.Goto "OPS" to select "TASS_v1.0.ops" and click on "One Package" at the bottom of Odin to selct the file "S5570DXKPD_S5570OLBKPD_S5570DXKPD_HOME.tar.md5" from the extracted zip file.
6.Click on the Start button to begin the process of update. Once you will see the Home Screen disconnect your phone from your PC.