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Samsung Galaxy S3 to get Jelly Bean 4.2 update at S4 launch - but leaked firmware available now

Samsung is thought to be fine tuning an official Android 4.2 Jelly Bean upgrade for the Galaxy S3 ahead of expected roll out alongside the Galaxy S4 this March.

However, it appears the much sought-after firmware update may already be within reach - or at least those of you with enough tech know-how to flash a custom ROM to your device.

You can download the I9300XXUFMB3 FW 'leaked' firmware from SamMobile now to start playing around with Android 4.2 on your Galaxy S3. The fan site provides step-by-step instructions to help you install the custom ROM on your Galaxy S3, but Samsung fanboys are reminded that they do so at their own risk.

Among the new features that await those willing to roll the dice are a refreshed Android 4.2 lock screen, new widgets, an improved Notification Center, Daydream, and Voice Command.

"We have FULLY TESTED this firmware and this firmware works perfect as any other official firmware," SamMobile claims.

However, some users commenting on the unofficial release noted minor bugs and glitches occurring after they flashed the custom ROM to their handset.

Samsung is expected to release an official Galaxy S3 Jelly Bean 4.2 update on 14 March, coinciding with the Korean manufacturer's unveiling of the Galaxy S4.

For more on Samsung's next-gen flagship, make sure to check out our Galaxy S4 news and rumour hub.