General Jelly Bean update to SGS3, after a repair

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http://androidforums.com – Hello Experts, Recently I had a problem with my SGS3 (running on Jelly Bean which was installed OTA). I heard crackling sound while playing music (earphone/speaker) and it was intermittent. Tried with different apps, but no luck. Finally I had sent my mobile back to the store where I purchased, for a repair by Samsung service center (Netherlands) and I got it back yesterday. Looks main issue is fixed now. Although I have noticed few things. -OS downgraded to ICS 4.0.0 (whereas it was Jelly Bean before sending for a repair). -Tried searching for an update through mobile and Kies. But no upda (General)