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I-phone 3GS newer model on 4.1 need to go up to 4.3 and not lose unlock
Phone : I phone Model : MC133B 3 GS newer model Current version : 4.1 (8B117) Modem Firmware : 05.12.01 Hi All I need some help :confused: I need to upgrade to at least 4.3 so I can use some apps etc. Thing is I need to keep my unlock and im wondering firstly can this be done ?? and if so...
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