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Hello friend , first , you can pay attention to your buttom of our GT1's back (a series of numbers Which marked with A912/S912/G912) . Second , the numbers who start with the A912 match the GT1---6255 edition , on the other hand , the G912/S912 match the GT1---9377 edition . From the sentences what you said , I guess your product match the QCA 9377 edition , so you just need to know which type your product is , the standard or the ultimate edition , you can choose proper firmware updating download in the forum . good luck to you . thank you . :loveliness:(just like the pictures)
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