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Is it possible to re-install the OS (Android 2.3.6) on to my GT-S5830i?

If yes, how can I get that done?

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You need to get yourself a fitting ROM (aka device-firmware, see also rom tag-wiki, Where can I find stock or custom ROMs for my Android device?), and then flash it to your device (instructions are usually provided where the ROM is provided). – Izzy Jun 18 '13 at 12:36
Why do you want to reinstall the OS? Have you replaced it with a custom ROM? – Dan Hulme Jun 18 '13 at 13:32
@DanHulme, perhaps the OP had an OTA update to ICS or something, and they wish to revert to an older version? Otherwise, it does seem strange to be asking how to revert (they already figured out how to install a custom ROM). – Stephen Schrauger Jun 18 '13 at 13:45
@StephenSchrauger I can make guesses too, but I think it's worth checking whether the OP genuinely needs to reinstall the OS. People from a Windows background sometimes think they should do that when they really just need to factory-reset. – Dan Hulme Jun 18 '13 at 15:40
For no particular reason, my phone becomes unresponsive. This has happened couple of times in the last 4-5 days and the only way I could bring it back to life is by removing and putting back the battery (nothing else works). I did try upgrading the firmware to the latest version but that has not worked. Is a factory reset an alternative? What all data will be erased if I do so? Thanks for the tips – Dev Jun 18 '13 at 15:50 can reinstall the OS.

There's a low level flash tool called heimdall (or Odin) that can be used to reinstall the firmware or install aftermarket firmware onto the Galaxy Ace.

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Thanks, will check that out – Dev Jun 18 '13 at 16:01
Ah, has original firnware images... – ce4 Jun 18 '13 at 17:05

you can do that in Kies, by updating to factory version from the update menu

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