To check your current T-Mobile Samsung Galaxy S II T989’s firmware, go to Settings>About phone>Software Updates and look at the build number.
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Latest Updates for T-Mobile Samsung Galaxy S II T989
Download the latest firmware here.
Country, Release Date, Version, Build Number
Unknown, 2013 July, 4.1.2, T989WXME1
USA (T-Mobile), 2013 March, 4.1.2, T989UVMC6
USA (T-Mobile), 2013 January, , T989UVLI4
Unknown, 2013 May, 4.1.2, T989DTLUMC4
Canada (Telus), 2013 March, 4.1.2, T989DTLUMC4
Canada (Koodo Mobile), 2013 March, 4.1.2, T989DTLUMC4