A
Android Question
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how to upgrade samsung galaxy s2 to jelly bean os
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The usual way is to install Samsung's Kies software (available from the Samsung website) on a PC, connect your phone with the USB cable, and use the "Check for updates" function in Kies to download and install available updates.
I hope this helps. If you require further help with this or any other aspect of your phone, please consider registering as a member and joining the friendly community in the Galaxy S2 (International) forum.
The usual way is to install Samsung's Kies software (available from the Samsung website) on a PC, connect your phone with the USB cable, and use the "Check for updates" function in Kies to download and install available updates.
I hope this helps. If you require further help with this or any other aspect of your phone, please consider registering as a member and joining the friendly community in the Galaxy S2 (International) forum.