You can update your Samsung Galaxy Ace 2 (GT-I8160) through Samsung KIES or via OTA. Make sure you fully charge your device’s battery before upgrading as the update is quite big.
Official Firmware Details:
Android Version: 4.1.2 – Build JZO54K
All the new Android 4.1.2 Jelly Bean Firmwares for the Galaxy Ace 2 (GT-I8160) are present in our Firmware Section as well. You can use our Firmware Section to manually update your device if for some reason you can’t officially update your device via Samsung Kies or via OTA as you are using a Custom ROM or if your country has yet not received the Android 4.1.2 Jelly Bean Update.
Dwonload Link Here.............