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You need to upgrade the firmware i guess...first press the reset button at the back of it with a pin to turn it off.Then to upgrade the firmware,you need to download the firmware from here.http://support.sony-europe.com/dna/downloads/firmware/firmware.aspx?site=odw_en_GB&m=NWZ-B135&f=FRM_NWZ_B13x_f after downloading,run it and then connect the player to system while holding the "volume -" button...it should be detected and the firmware would be restored.
Hi mymp3 NWZ-B173F is full charging but not turn on
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