How to Flash or Install S5830XXKPT, Firmware Upgrade Galaxy Ace to Android 2.3.6 Gingerbrd

Here's the procedure on how to manually upgrade the Galaxy Ace GT-S5830 to Android 2.3.6 Gingerbrd using the stock ROM S5830XXKPT. This is a Russian official firmware update for Galaxy Ace that has been recently relsed this March 2012. Some changes is the lock screen ftures, much more faster than the previous build S5830XXKPP and S5830XWKT7.  Some Europn languages are included