I have a card reader that I use to plug into a USB port on my PC to load my sideimages into my computer and it works great. But how do I upload back onto the SD card from the PC so I can so I can update my 997 with any new updates from humminbird? The card reader only reads the card for the PC but I dont think it has the capability to actually turn around and load data onto it right? I dont have an SD slot on my computer so that is out.