It's possible, but I doubt, that your upgrade impaired your S3's ability to play out of the headphones. I would suspect a faulty headphone jack. Nothing I've seen on the US variant would stop the headphones from working, save for turning the volume all the way down. The headphones do seem to have their own volume setting. If that's not it, a factory reset may help. If not, I'd take it back to the store you bought it from or call Samsung to see if they'll replace the unit.
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