Just bought a used F700BT and installed it

Was upgraded by previous owner to 4.001 and 3.000

Came with no SD card

 

I have tried to put music (mp3) on two separate cards (8GB SDHC Class 6 & 8GB Mirco SDHC in SD adapter)

Have tried many different configurations, folders, resetting unit, ect. and neither card will load

What am i doing wrong?