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Samsung Galaxy A21 gets Android 11 and One UI 3.1 update in the United States - Gizmochina
Galaxy A21s receives Android 11 early, Galaxy A51 gets One UI 3.1 - GSMArena.com news
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Android 11 and One UI 3.1 update is finally live for Galaxy A21 in USA - SamMobile
Android 11 and One UI 3.1 update is finally live for Galaxy A21 in USA - SamMobile
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How to Update to Android 12 on Samsung
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