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Update Galaxy S3 to Android 4.3 I9300XXUGML3 Official Firmware [GUIDE]

Samsung has rolled out yet another Android 4.3 Jelly Bean based maintenance and bug-fix update for its global variant of Galaxy S3, with a new stock firmware build I9300XXUGML3. This build is a follow-up release to I9300XXUGML2 that arrived just a few days back, following the outcry of users over inherent bug issues with latest Jelly Bean updates.