My PC wont recognise my Sansa e250

I know its not a PC problem and its most likely got something to do with the firmware or something.

I had installed rockbox on it but then it kept freezing so i tried to uninstall it and when i connected it to the PC it would show the USB symbol on the device and not show up on the PC. I finally (no clue how i did it) uninstalled rockbox and reverted back to the normal firmware. But now when i plug it in it only detects the sansa players internal flash drive and NOT my microSD card. However the player shows all the songs on it from my micro card when i play it.