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[canna8510]

Dear xperia masters, I would like to ask a few questions, I have xperia ntt docomo xi, which is xperia zr for Japan version. I would want my xperia for using lte band, which is available when using service menu tests, but locked when manually selected from the option menu. But I dont want to flash new c5503 firmware into my phone as i dont want to lose 32 gb rom options.