Unroot is one of the required thing before you get back the manufacturer warranty. Flashing stock ROM is one of the known way to unroot Samsung Galaxy S3 beside root process related unroot file. Unrooting your Galaxy S3 I9300 sometime bring problem such as problems with the CSC and Messages App. Here is a fix for S3 CSC Unknown issue that originally compiled by XDA Senior Member brianius. Here is that easy to follow step by step guide: Flash the Stock ROM one version older than the Stock ROM you want to install. If you want Android 4.0.4 ICS then
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