Help transferring waypoints

[jeremy z]

Just picked up new HDs live units. I have exported files on to a couple different sd cards but can’t get the new units to read it? I have also tried hooking my old unit gen 3 up front to see if I could get them to transfer like they would with the previous units. No luck. I was told maybe my sd cards were to large? I bought a 16g and tried again with no luck.
Any suggestions greatly appreciated