My Samsung Galaxy S4, why is it when I plug my phone in through usb to a laptop it doesn't read my phone?

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samsung galaxy s4 when i plug my phone in through usb to a laptop it dosent read my phone!

my freind rooted my phone i while ago and now it dosnet seem to read when i plug it into the computer i checked the cables the developers options and the usb debbuging no one seems to know what the problem is and also this is an AT&T phone and im in europe on vacation and i got it sim unlocked and i cant do software updat it says something like DM instalization not ready or check mobile data the phone works fine i have unlimeted data internet works i can recive and make phone call and text messages but if i want to send a picture message it dosent let me im thinking about a master reset can anyone help me? Tom
 

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