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Possible Duplicate:
How do I update the OS on my device?

I have a Samsung Galaxy S (LCD version) with stock Android 2.2. How can i upgrade it to Android 2.3?

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marked as duplicate by Matthew Read Dec 2 '12 at 20:07

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

See related, there are a lot of posts about android upgrading. – Diogo Jun 14 '11 at 11:45
AFAIU, it must be possible to upgrade the OS even without connecting the phone with a USB cable to another computer -- . If you have the file with the update. – imz -- Ivan Zakharyaschev Aug 17 '12 at 7:32

Install KIES from the Samsung website and connect your phone to the PC via the USB cable. If a system update is available, KIES will inform you and walk you through the upgrade process.

If you'd like to install an alternative ROM like CyanogenMod, you'll need to follow relevant installation details on the site or alternatively use an app like ROM Manager that can help do the needful.

As with all upgrades, back up your data to another location.

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