1. you can or not able to connect via usb? I asked tat question and gotten a response to DL a fewware, and now can access via USb.
2 te OP-S cannot view the sd card, and a App must be Dl . try Dl a app to read the card, ten go into the file and delete., if not.
3 wit the supplied sd adp, plug to pc/mac, open folders file delete.