@ericute

you bet its really very frustrating,thats what I felt when I had that issue. If reformatting those M2s wont solve the problem, you really dont have a choice but to but a new 1 especially if the symptom is like this one, the phone can detect how many contents you have there in the mem card but it cant open it, its a mem card issue, but if the phone wont detect the mem card itself it migh be a hardware problem. try reformatting the mem cards first.