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Hello, I have my band 3 with nfc I tested the firmware version in Portuguese, it went well but I do not know what happened I was left with some invalid characters "?" for example "cart?es" , "frequ?ncia", "notifica?oes" etc etc, already tried everything to revert to the original firmware in Chinese and it gets all with invalid characters like this "?" inside a small square, could you please help me?