The Samsung I9100 Galaxy S II is just about to get another firmware update, bumping its Android version to 2.3.4. What's even better, the updated ROM surfaced online a little early, so the most impatient among you can get it right away.
As the tiny version number change (2.3.3 to 2.3.4) suggests, this isn’t the most major of updates, but there is still plenty to look forward to. For one, the Galaxy S II will finally get Google Talk video calls enabled. Early adopters also report an improvement in battery life. The new modem drivers are also said to bring notably better reception for some.
However, you should bear in mind that will, most probably, void your warranty. Also installing the ROM might damage your device, so you should only proceed if you know what you are doing.
I have successfully upgraded my SII with V 2.3.6
Did you tried this tutorial, I think this is better: http://www.phonesarchive.com/tutorials/how-to-update-samsung-galaxy-s-ii-to-android-234-gingerbread.html
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