Galaxy Ace 2 users running Jelly bean operating system can now easily root their phones. You must have SD card inserted into your Samsung Galaxy Ace 2 before you follow these steps.
1. Download the root zip file from here and place it in the root of your SD card.
2. Reboot to the stock recovery.
3. Select install update from external storage.
4. Select the root.zip file.
That is it. You have rooted your Galaxy Ace 2. Jelly Bean brings project butter to the phones which brings some extra smoothness to the user interface. It also brings a host of under the hood improvements that include numerous bug fixes and improved performance.