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When I transfer files to a micro sd card, almost all of them get deleted. That have happened 3 times.
My phone locked me out removed all data and refused to recognise my pin, ,three days ago,which I wrote down. Put the phone to factory setting it costs , but then get a back up device to save the precious memories and have that stored on a disc in case of problems with the back-up device-welcome to the world of computers.