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The title sais is all

Question:How to update The Samsung galaxy S2(GT-I9100) to 4.1.2

Note: I am using Ubuntu 12.10

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You will have to wait till it's distributed for over-the-air updates. Or you root it. – Martin Schröder Feb 26 '13 at 10:17
Most probably using kies if they have any version for Ubuntu or you can use Odin also if they have made any version for Ubuntu. Or you can use Virtual PC and install Windows on that then use Kies for this purpose. – avirk Feb 26 '13 at 12:47

You can use Heimdall. Its a cross-platform tool suite used to flash firmware, more or less like Odin, but opensource. It has a binary that can be installed in your Ubuntu version.

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