I'm in the same situation with my wife's phone. I rooted it and put CleanROM on there back in May so it's on the old 4.3. I don't have the S3 anymore so I haven't followed along. However, from what I understand, I should be able to leave her phone the way it is and just flash 4.4 from the download link? Do I flash it or ODIN? Will it wipe data or storage or anything?
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It'll completely wipe everything, it's a factory stock image.
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