How to Install/Upgrade Galaxy Gio to Android 2.3.6 S5660XXKTL/S5660XXKTK Stock Firmware

Here's how to manually upgrade the Galaxy Gio S5660 to the latest official Android 2.3.6 Gingerbrd S5660XXKTL and S5660XXKTK firmware update by using the original stock ROM. Some of you may not probably get upgraded yet, for this firmware is only available in selected countries and can only get thru Kies. But if your outside of this countries Kies will not let you update your Galaxy