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I want to upgrade my Galaxy S II to Android 2.3.5, and my provider only has 2.3.3. So I have to use a ROM from samfirmware.com. Do I have to SIM unlock my phone before installing one of these ROMs? Do I have to root it?

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The Galaxy S2 has an unlocked bootloader, which means you can install any rom on it, rooting is not mandatory, some roms have root privileges, some don't.

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Also, it's not necessary to SIM unlock. This is separate from the bootloader being unlocked. – onik♦ Oct 10 '11 at 12:28

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