This is the stock firmware S5830IDXLB1 of the latest re-version of Samsung Galaxy Ace GT-S5830i which is for Asian regions like Malaysia, Indonesia, Singapore, Thailand, Philippines and Vietnam. The GT-S5830i is also been available in Europe countries. This firmware is not for older version which is GT-S5830 only (check out the product code with "i"). These two phones are both identical with each other at first glance but you can notice that on GT-S5830i the power / screen lock slider buttons from standby is not around.
Latest firmware: S5830IDXLB1/S5830IOLBLB1/S5830IDXLB1/S5830IDXLB1
Version: Android 2.3.6 Gingerbread
Modified: 2/7/2012 2:31:30 PM
You can grab these stock ROM here.