My complete tutorial to upgrade Galaxy S6 to Android 10 Q is available here : https://forum.xda-developers.com/galaxy-s3/help/guide-tutorial-samsung-galaxy-s3-i9300-t3491788
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My complete tutorial to upgrade Galaxy S3 to Android 7.1 Nougat is available here : https://forum.xda-developers.com/galaxy-s3/help/guide-tutorial-samsung-galaxy-s3-i9300-t3491788
My complete tutorial to upgrade Galaxy S6 to Android 10 Q is available here : https://forum.xda-developers.com/galaxy-s3/help/guide-tutorial-samsung-galaxy-s3-i9300-t3491788
Every feedback is appreciated.