The Android 2.3.6 Gingerbread firmware update for 'Singtel' Singapore version of Samsung Galaxy Ace is now recently online over Samsung Kies server. The build number is S5830DXKT5 with a build date of December 20, 2011. This is the firmware update from previous version S5830DXKPD which is Android 2.3.4 Gingerbread. This must be also available for all South East Asian countries like, Indonesia, Thailand, Malaysia, Vietnam and Philippines sooner.
Model: Samsung Galaxy Ace GT-S5830
Provider/Country: SINGTEL - Singapore
Product Code: GT-S5830OKAXSO
Latest firmware: S5830DXKT5/S5830OLBKT3/S5830DXKT4/S5830DXKT5
Version: Android 2.3.6 Gingerbread
As for now the Android 2.3.6 has been already been first spotted rolled out across Nordic Countries S5830XWKT7, other European regions no sign so far.
Here's the detailed guide on how to manually upgrade your Galaxy Ace to Android 2.3.6 using Odin downloader and the S5830DXKT5 stock ROM.
Check out the list of available Stock ROM for Samsung Galaxy Ace here.